Online Test

Question # 1

Galena is an ore of

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Gallium

Lead

Tin

Germanium

Enzymes are

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Proteins

Mineral

Oils

Fatty acids

Reaction of ethylamine with chloroform in alcoholic KOH producers

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

In the manufacture of iron from haematite,limestone is added to act as.

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Flux

A reducing

Slag

An oxidizing agent.

The formula of nitre is

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KNO₃

NaNO₃

NaCI

Na₂CO₃

The maximum number of electrons in a subshell for which / = 3 is

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14

10

8

4

All the naturally occurring processes proceed spontaneously in a direction which lead to

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Decrease of entropy

Increase of enthalpy

Increase of free energy

Decrease of free energy

The total number of protons in 10 g of calcium carbonate is (N_o = 6.023 x 10²³)

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1.5057 x 10²⁴

2.0478 x 10²⁴

3.0115 x 10²⁴

4.0956 x 10²⁴

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

When electricity is passed through molten AI₂O₃ + Na₃AIF₆ and 13.5 gms AI are deposited,the number of faraday must be

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0.5

1.0

1.5

2.0

Which is the most amphoteric?

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Na₂O

MgO

AI₂O₃

CaO

Which of the following is not present in RNA?

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Uracil

Thymine

Ribose

Phosphate

The rate of a reaction that does not involve gases does not depend upon

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Pressure

Temperature

Concentration

Catalyst

Inert pair effect plays an important role in case of

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F

AI

Si

TI

Fluorine does not show positive oxidation states due to the absence of

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d-orbitals

s-orbitals

p-orbitals

None

Isopropyl alcohol on oxidation forms

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Acetone

Ether

Ethylene

Acetaldehyde

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄ or LiAIH₄?

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1-Propanol

2-Propanol

2-Methyl-2-propanol

Ethanol

The equilibrium constant in a reversible chemical reaction at a given temperature

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Depends on the initial concentration of the reactants

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentrations of recatants

Is not characteristic of the reaction

The number of electrons in the M shell of the element with number 24 is

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24

12

13

8

Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

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11%

33%

44%

22%

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

With increasing principle quantum number the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remains constant

Decreases for low value of Z and increases for higher value of Z.

1-Chloropropane has two isomers It is an example of

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Chain isomerism

Position isomerism

Functional group isomerism

Metamerism

Salol is prepared from

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Salicylic acid and phenol

Salicylic acid and methyl alcohol

Both

None

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde

Chile salt petre is

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NaNO₃

Na₂SO₄

KNO₃

Na₂S₂O₃

Which of the following fluorides of xenon in impossible?

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XeF₂

XeF₃

XeF₄

XeF₆

The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on

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Pressure of the gas

Temperature of the gas

Volume of the gas

Pressure temperature and volume of the gas

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion force

Hydrogen bonds

All of these

Which of the following value of ΔHf° represent that the product is least stable?

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-94.0 kcal mol^-1

-231.6 kcal mol^-1

+21.4 kcal mol^-1

+64.8 kcal mol^-1

Which of the following substances is used as an antiknock compound?

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Tetraethyl lead

Lead tetrachloride

Lead acetate

Ethyl acetate

Red lead is

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PbO

Pb₃O₄

PbO₂

Pb₄O₃

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

Potassium is kept in

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Water

Ammonia

alcohol

Kerosene

The spectrum of helium is expected to be similar to that of

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H

Li⁺

Na

He⁺

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

Which of the following has greatest reducing power?

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HI

Hbr

HCI

HI

The unit of rate constant for a zero order reaction is

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Liter sec^-1

Liter mol^-1sec^-1

Mol liter^-1sec^-1

Mol sec^-1

1 mole of CH₄ contains

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6.02 x 10²³ atoms of H

4 g-atom of hydrogen

1.81 x 1023 molecules of CH₄

3.0 g of carbon

The following has zero valency

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Na

Be

AI

Kr

Which of the following fluorides does not exist?

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NF₅

PF₅

AsF₅

SbF₅

Ascorbic acid is a chemical name of

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Vitamin D

Vitamin A

Vitamin C

Vitamin B₆

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

On heating acetaldehyde with ammonical silver nitrate solution we get

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CH₃OH

Silver acetate

HCHO

Silver mirror

The number of atoms in 0.0004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Which of the following cannot be produced by acidic dehydration of alcohols?

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Ethers

Aldehyde

Alkyl Hydrogen sulphate

Alkene

Magnesium keeps on burning in

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N₂

CO₂

N₂O

N₂ as well as CO₂

Which of the following geometry is associated with the compound in which the central atom assumes sp³ d hybridization?

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Planar

Pyramidal

Angular

Trigonal bipyramidal

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

Formic acid is obtained when

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Calcium acetate is heated with conc.H₂SO₄

Calcium formate is heated with calcium acetate

Glycerol is heated with oxalic acid

Acetaldehyde is oxidized with K₂CrO₇and H₂SO₄

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

The ratio of the ionization energy of H and Be³⁺ is

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1 : 1

1 : 3

1 : 9

1 : 16

The IUPAC name of the compound having the formula (CH3) 3 C - CH = CH2 is

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1, 1 -Dimethyl-3-butene

1,1,1-Trimethyl-3-propene

3,3,-Dimethyl-1-butene

3,3,3-Trimethyl-1-propene

The total pressure exerted by a number of non reacting gases is equal to the sum of partial pressure of the gases under the same conditions is known as

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

During the folding of filter paper the apex form angle of about

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80^o

60^o

180^o

90^o

Which has the largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

The pore size of the filter paper depends upon

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Nature of the medium

Temperature of the medium

Size of the particles

Mass of the particles

Sodium thiosulfate is used in photography because of its

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Oxidizing behaviour

Reducing behaviour

Complexing behaviour

Photochemical behaviour

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

Leblanc process is employed in the manufacture of

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Baking soda

Washing soda

Potash

Plaster of paris

The equilibrium

Cr₂O^2-₇ 2CrO²₄ is shifted to right in

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An acidic medium

A basic medium

A neutral medium

It does not exist

The relative rate of diffusion of a gas (molecular wright - 128) as compared to oxygen is

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2 times

1/4

1/8

1/2

The treatment of benzene with isobutene in the presence of sulphuric acid give

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Isobutyl benzene

Tert-Butyl benzene

n-Butyl benzene

no reaction

Hess's law deals with

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Changes in heat or reaction

Rate of reaction

Equilibrium constant

Influence of pressure on volume of a gas

Which of the following is an example of body centred cube?

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Magnesium

Zinc

Copper

Sodium

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

Natural fertilizer from plants and animals provide nitrogen

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1.5 kg

3.0 kg

4.5 kg

6 kg

The last orbit of argon would have electrons

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8

18

2

6

In a reversible chemical reaction having two reactants in equilibrium if the concentration of the reactants are doubled then the equilibrium constant will

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Also be doubled

Be halved

Becomes one fourth

Remains the same

How many kinds of space lattices are possible in a crystal?

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23

7

230

14

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

Wt. of 112 ml of oxygen at NTP on liquefaction would be

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0.32 g

0.64 g

0.16 g

0.96 g

Number of elements presents in the fifth period of periodic table is

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8

10

18

32

Carbon atom holding halogen in aryl halides is

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Sp²-hybridesed

Sp³-hybridesed

Sp-hybridesed

Sp³d -hybridesed

Which metal is protected by a layer of its own oxide?

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AI

Ag

Au

Fe

Which of the following will not change the concentration of ammonia in the equilibrium N₂(g) + 3H₂(g) 2NH₃(g): ΔH = -kj

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Increase of pressure

Increase of temperature

Decrease of volume

Addition of catalyst

The rate of a reaction can be increased in general by all the factors except by

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Using a catalyst

Increasing temperature

Increasing the activation energy

Increasing the conc. of reactants

The carbon atoms in calcium carbide are held by

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Ionic bonds

2 sigma bonds

2 covalent one co-ordinate bond

2 π and one σ bond

Among the alkaline earth metals the element forming predominantly covalent compounds is

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Be

Mg

Sr

Calcium

Which is not a colligative property?

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Osmotic pressure

Lowering of vapour pressure

Depression of freezing point

Elevation of boiling point

A certain liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphare solution?

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12.7 gm

15.9 gm

31.8 gm

63.5 gm

Which of the following process is used to separate insoluble particles from liquids?

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Separation

Filtration

Crystallization

Condensation

The halide which is not hydrolysed is

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SiCI₄

SiF₄

CCI₄

PbCI₄

Bromine is obtained on a commercial scale from

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Caliche

Carnallite

Common satl

Cryolite

Gooch crucible is used for the filtration of precipitates having

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High solubility

High concentration

High ignition temperature

Low temperature

A zero order reaction is one whose rate is independent of

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Temperature of the reaction

The concentration of the reactants

The concentration of the products

The material of the vessel in which the reaction is carried out

The weight of 11.2 liters of CO₂ at S.T.P. would be

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88 g

44 g

32 g

22 g

Sulphure dioxide affects

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Cell wall

Plasmodesmata

All membrane systems

Nucleus

Which of the following imparts violet colouration to the non-luiminous flame of Bunsen burner?

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NaCI

BaCI₂

CaCI₂

KCI

Which has maximum protein content?

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Ground nut

Cow milk

Egg

Wheat

For the carbylamine reaction we need hot alc.KOH and

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Any amin and chloroform

Chloroform and Ag powder

A primary amine and chloroform

A mono alkyl amine and trichlorom-ethane

The percentage of nitrogen in urea is

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46

60

70

80

BiCI₃ on hydrolysis forms a white precipitate of

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Bismuthio is acid

Bismuth oxychloride

Bismuth pentachloride

Bismuth hydroxide

Toluene can be oxidized to benzonic acid by

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KMnO4 (alk)

K₂Cr₂O₇(acidic)

Both

None

Which of the following is directly related to Qualitative analysis?

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Identification

Separation

Measurement

Calculation

When sulphur is boiled with Na₂SO₃solution the compound formed is

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Sodium sulphides

Sodium sulphates

Sodium persulphate

Sodium thiosulphate

Octane number can be changed by

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Isomerisation

Alkylation

Cyclisation

All of these

The molal elevation constant is the ratio of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solute

Mole fraction of solvent

Which one is the property of an ideal solvent

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Should be expensive

It should react chemically with the solute

Impurities should crystallize along with the solute

Should be safe to use

Propyne on hydrolysis in presence of H₂SO₄ and HgSO₄ gives

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Acetaldehyde

Actone

Formaldehyde

None

Hydrolytic conversion of sucrose into glucose and fructose is known as

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Induction

Inversion

Insertion

Inhibition

Which of the following alkali metal hydroxides is the strongest base?

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LiOH

NaOH

KOH

CaOH

Rusting of iron is catalysed by

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Fe

O₂

Zn

H⁺

Which of the substances Na, Hg, S Pt and graphic can be used as electrodes in electrolytic cells having aqueous solution?

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Na,Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

In which molecule carbon atom is sp² hybridized

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CH₄

C₂H₄

C₂H₂

None of the above

The symbol of the element whose atoms have the outer most electronic configuration 2s² 2p³ is

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N

Li

P

Na

When electrons revolve is stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Addition of iron filling to CuSO₄solution caused precipitation of Cu awing to the

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Reduction of Cu²⁺

Oxidation of Cu²⁺

Reduction of Fe

Reduction of Fe³⁺

The dimension of rate constant of a second order reaction involves

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Neither time nor concentration

Only time

Time and concentration

Time and square of concentration

Benzene + Ozone → Y. in this sequence Y is

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Benzene monoozonide

Benzene diozonide

Benzene triozonide

Succinic acid

Most common reactions of benzene and its derivatives are

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Electrophilic addition reactions

Electrophilic substitution reactions.

Nucleophilic addition reactions

Nucleophilic substitution reactions

The vapour density of a gas is 11.2 The volume occupied by 11.2 g of this gas at N.T.P is

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22.4 liters

11.2 liters

1 liter

2.24 liters

Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

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Mercury

Lead

Nitrogen oxide

Sulphur oxide

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Which of the following represents elements in order of increasing atomic size?

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I,Br,CI

Na,Mg,C

C,N,O

Li,Na,K

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

The reaction/method that does not give an alkane is

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Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halid.

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCI^-

CI₂

CI^-

The wire in the flash bulbs is made up of

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Mg

Ba

Cu

Ag

Which one of the following elements occurs free in nature?

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N

P

As

Sb

Vitamin A is present in

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Liver

Milk

Green vegetables

All

Which of the following mineral does not contain AI?

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Cryolite

Mica

Feldspar

Fluorspar

The reference calomel electrode is made from which of the following?

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ZnCI₂

CuSO₄

Hg₂CI₂

HgCI₂

Fertilizer are made by

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Nature only

Artificial methods only

Both artificial and natural methods

None of the above

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

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Hydrolysis

Oxidation

Hydrogenation

Electrolysus

Cheif air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

Sodium metal cannot be stored under

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Benzene

Kerosene oil

Alcohol

Toluene

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Which one of the halogen acid is a liquid?

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HF

HCI

HBr

HI

Natural fertilizer provides potassium in the form of K₂O (potash)

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1.5 kg

3 kg

4.5 kg

6.5 kg

Which species represents the electrophile in aromatic nitrotaion?

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NO^-₂

+

NO₂

NO2

NO^-₃

The percentage of oxygen in NaOH is

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40

60

8

10

Calcium cyanamide on treatment with steam under pressure gives NH₃ and

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Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

Water (H2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphur has high electronegativity than oxygen

Water molecules associate through hydrogen bonding.

In a crystal a ≠ b ≠ c, a = γ = 90° and β ≠ 90°, it is

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Monoclinic

Rhombic

Trigonal

Tetragonal

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Evaporation of water is

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An exothermic change

An endothermic change

A process where no heat changes occur

A process accompanied by chemical

Vital force theory was rejected by

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Berzelius

Kolbe

Wholer

Lavoiser

The rate at which a substance reacts depends on its

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Atomic weight

Equivalent weight

Molecular weight

Active mass

Setting of plaster of paris involves

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Oxidation with atmospheric oxygen

Combination with atmosphere CO₂

Dehydration

Hydration to yield another hydrate.

The bond angle H - O - H in ice is closest to

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120° , 28°

60°

90°

109°

The rotation of two carbon atoms joined by double bond would happened only if

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Pi bond is broken

Sigma bond is broken

Both bonds are broken

None of above

The essential component of organic compound is

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O

C

P

N

Ammonia gas used directly as a fertilizer is injected into the soil at a depth of about

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Two inches

Three inches

Five inches

Six inches

Which of the following is different from the other three oxides?

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MgO

SnO

ZnO

Cr₂O₃

The substance used as a smoke screen in warfare is

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SiCI₄

PH₃

PCI₅

Acetylene

Causticisation process is used for the preparation of

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Caustic soda

Caustic potash

Baryata solution

Slaked lime

How many moles of Helium gas occupy 22.4 L at 0^oC at 1 atm.Pressure?

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0.11

0.90

1.0

1.11

What quantity of limestone (CaCO₃) on heating will give 56 kg of CaO?

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1000 kg

56 kg

44 kg

100kg

Which of the following units represents largest amount of energy?

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Calorie

Joule

Erg

Electron vol.

Which of the following halogens does not forms its oxyacids?

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Fluorine

Chlorine

Bromine

Iodine

The number of atoms contained in 11.2 L of SO₂ at S.T.P are

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3/2 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

4 x 6.02 x 10²³

An endothermic reaction is one in which

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Heat is converted into electricity

Heat is obsorbed

Heat is evolved

Heat is converted into mechanical work

In cold countries ethylene glycol is added to water in radiators of cars during winter It result in

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Lowering in b.pt.

Reducing viscosity

Reducing specific heat

Lowering in freezing pt.

Gooch crucible used to filter the solution of

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H₂SO₄

HCI

KMnO₄

Both B & C

Bell metal is an alloy of

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Cu,Zn,and Sn

Cu,Zn and Ni

Cu and Zn

Cu and Sn

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

Benzene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

Ethanol containing some methanol is called

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Absolute spirit

Rectified spriit

Power alcohol

Methylated spirit

If the solvent is inflammable for heating purpose we use

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Ice bath

Water bath

Wire gauze

Thermostat

Wholer prepared ures from

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Ammonia

NH₄CNO

NH₃

uric acid

Acetic anhydride is obtained form acetyl chloride by the reaction of

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P₂O₅

H₂SO₄

CH₃COONa

CH₃COCH₃

Which is the most volatile compound?

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HI

HCI

HBr

HF

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

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The shielding constant

The atomic number

The charge on the nucleus

Both the nuclear charge and the shielding constant

Ozone is not

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An allotrope

A powerful oxidizing agent

Paramagnetic

A bent molecule

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

Saturated solution of NaCI on heating becomes

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Super saturated

Unsaturated

Remains saturated

None

The addition of HBr is easiest with

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CH2 = CHCI

CICH = CHCI

CH3 - CH = CH2

(CH3)2 C = CH2

When pressure is applied to the equilibrium system Ice Water Which of the following phenomenon will happen?

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More ice will be formed

Water will evaporate

More water will be formed

Equilibrium will not be formed

Heating a mixture of sodium benzoate and soda lime gives

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Methane

Benzene

Sodium benzene

Calcium benzoate

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³,4s¹,4p¹

3d²,4s²,4p¹

In N.W.F.P the phosphate fertilizer are produced at

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D.I.Khan

Haripur

Nowshera

Dargai

Which of the following has least mass?

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2 gram atom of nitrogen

3 x 10²³ atoms of C

1 mole of S

7.0 g of Ag.

According to MO Theory the species O⁺₂ possesses

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

The structure of XeF₆

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Distorted octahedral

Pyramidal

Tetrahedral

None of the above

The relative rates of diffusion of a gas (Mol, wt. - 98) as compared to hydrogen will be

Choose an answer

1/7

1/5

1/4

1

Mark the smallest atom

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F

CI

Br

I

SO₂ and NO₂ pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

Cyclone collector is used for minimizing

Choose an answer

Radioactive pollution

Air pollution

Noise pollution

Water pollution

Portland cement is manufactured by using

Choose an answer

Limestone,clay and sand

Limestone,gypsum and sand

Limestone,gypsum and alumina

Limestone,clay and gypsum

Which one of the following has the lowest boiling point?

Choose an answer

B

AI

Ga

Ti

At 500 K the equilibrium constant for reaction cis-C₂H₂CI₂ trans-C₂H₂CI₂ is 0.6. At the same temperature the equilibrium constant for the reaction trans-C₂H₂CI₂ cis-C₂H₂CI₂ will be

Choose an answer

0.60

1.67

0.66

2.6

The number of unpaired electrons in the P-subshell of oxygen atom

Choose an answer

1

2

3

4

Which of the following statement regarding catalyst is not true?

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A catalyst remains unchanged in composition and quantity at the end of the reaction

A catalyst can initiate a reaction

A catalyst dose not alter the equilibrium in a reversible reaction

Catalysts are sometimes very specific in respect of reaction

An exothermic reaction is one in which the reacting substances

Choose an answer

Have more energy than the products

Have less energy than the products

Have the same energy as the products

Are at a higher temperature than the products

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

CsI

CsF

ΔH_{Neutralisation} is always

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Positive

Negative

Zero

Positive or negative

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

If N_A is Avogadro's number then number of valence electrons in 4.2 g of nitride ions N^3-is

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2.4 N_A

4.2 N_A

1.6 N_A

3.2 N_A

Bragg's law is given by equation

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n λ = 2 θ sin θ

n λ = 2 d sin θ

2nλ = d sin θ

nλ = 1/2 d sin θ

If a salt bridge is removed between the two half cells the voltage

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Drops to zero

Does not change

Increases gradually

Increases rapidly

Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

Which of the following species participate in sulphonation of benzene ring?

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H₂SO₄

HSO^-₃

SO₃

SO^-₂

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm. atomic weight

One gm. Equivalent weight

Electrochemical equivalent

None of the above

Which one is primary alcohol?

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Buten-2-oI

Propan-2-oI

Butane-1-oI

2,3-Dimethylhexane-4-oI

Ionic solids with defects contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacancies

Cation vacancies only

Cation vacancies and interstitial cations

A cell constant is generally found by measuring the conductivity of aqueous solution of

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BaCI₂

KCI

NaCI

MgCI₂

In crystal structure of sodium chloride the arrangement of CI^- ions is

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Fee

Both fee and bcc

Bee

None of these

In the equilibrium

N₂ + 3H₂ - 2NH₃ + 22 kcal the formation of ammonia is favoured by

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Increasing the pressure

Increasing the temperature

Decreasing the pressure

Adding ammonia

Which one is not usually used for the crystallization

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Acetone

Acetic acid

Sulphuric acid

Chloroform

A solution of sodium sulphate was electrolysed using some inert electrodes.The products at the electrodes are

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O₂, H₂

O₂, Na

O₂, SO₂

O₂, S₂O²-₈

The principle constituent of pyrex glass is

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Zn

B

Pb

CI

Ethyl chloride on treatment with aqueous alkali gives

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Ethane

Ethene

Ethanal

Ethanol

Detergents are

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Synthetic products

Natural products

Both A and B

None of the above

By using the fluted filter paper rate of filtration is

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Increased

Decreased

Filtration is constant

Having no effect

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCI + anhyd. ZnCI₂

NaCI

PCI₅

SOCI₂

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

Alum is not used

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As a mordant in dyeing

As an insecticide

In purification of water

In tanning of leather

Which quantum number is sufficient to describe the electron is hydrogen atom?

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/

n

m

s

For the reaction

2A(g) + B(g) 3C(g) + D(g)

two moles each of A and B were taken into a flask The following must always be true when the system attained equilibrium

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[A] = [B]

[A] < [B]

[B] = [C]

[A] > [B]