Question # 1

The existing property of an element in to more than are crystalline state is termed as:

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isomorphism

polymorphism

isotropy

allotropy

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

pH of 10-4 mole dm-3 of HCl

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2

4

3

5

The question vapour cause by heating a liquid is due to:

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increase of intermolecular interactions

increase of K.E of molecules

decrease of surface tension

increase in potential energy of molecules

A graph is plotted, P on x-axis and V on y-axis for a given mass at constant temperature, we shall get:

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a curve with different peaks

a curve called isotherm

straight line parallel to x-axis

a straight line

In order to determine ∆H (latt) of ionic compound which is correct relationship

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∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

Which of the following is pseudosolid?

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CaF₂

Glass

NaCl

All

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

The cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

Reaction kinetics is important to discover the---under which reaction will proceed most economically:

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rate constant

Conditions

volume

equilibrium point

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

Compressibility factor for an ideal gas is

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1.5

1.0

2.0

0.5

Diamond and silicon carbide are insoluble in all solvents because

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they have high melting and boiling points

absence of three electrons

they are huge giant three dimensional molecules (macromolecules)

their unit cells have tetrahedral geometry

Which compound gives carbon when heated with conc. H2SO4.

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Starch

Ethyl alcohol

Oxalic acid

Formic acid

What is not correct about ∆HF

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It is always negative

Ìts value gives an idea about the relative stability of reactants and the products.

Its value can be greater or less than zero

Value depends upon nature of bonds

Cl₂is a gas while iodine is a solid due to

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stronger London forces with high polarizability

greater electro negativity of Cl than iodine

stronger dipole dipole forces

iodine is colored while chlorine is colourless

The kinetic energy of three moles of gas is:

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3/2 RT

3 RT

1/2 RT

2 RT

Which of the following ketone will not give iodoform test

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Methyl isopropyl ketone

Dimethyl ketone

Ethyl isopropyl ketone

2-hexanone

covalent network of crystals has:

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lower melting point than molecular crystals

higher melting point than molecular crystals

H-bonding

Benzene reacts with Ethyl chloride in presence of AICls to give

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Benzalchloride

Benzyl chloride

Ethyl benzene

Benzotrichloride

Liquefaction of gas can only be carried out if the:

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without caring for the value critical volume at critical stage

the temperature is more than critical and pressure is 1000 atm

the temperature is below the critical and pressure is very high

temperature is above the critical temperature and pressure can have any value

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

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0.32 g

0.64 g

0.16 g

0.96 g

For gas obeying Boyle's law if pressure is double, the volume becomes:

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Remains constant.

Double.

One half.

None of above.

Which of the following formula is correct for density of any gas

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d = RT/PM

d = PM/RT

d = MT/PR

d = RM/PT

The partial pressure of 0₂in the lungus is

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116 torr

159 torr

560 torr

760 torr

Phenol is completely soluble in water above

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25°C

62.3℃

68.5°C

66.50°c

lonic bond is produced after complete transfer of

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nucleus

neutrons

electrons

protons

In beta elimination reaction

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carbon number changes

unsaturated compound is formed

hybridization. ofC remains same

pi bonds are decreased

In Case of elements the polymorphism is called

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Isotopic form

Allotropy

Isomorphism

Crystalline forms

At what temperature, would N₂molecules have the same average speed as He-molecules at 300 k?

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1100 K

2100 K

420 K

None

Nitro alkanes exhibit the:

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Chain isomerism

Positional isomerism

Functional group

Metamerism

Deep sea divers breath air under increased pressure, therefore they use a mixture of

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96% N₂and 4% O₂

96% O₂and 4% N₂

94% N₂and 6% O₂

94% 0₂and 6% N₂

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

In the transition state of S2 mechanism reaction with alkyl halides, which of the following orbital hybridization is involved

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sp³

sp

sp²

dsp³

Which of the elements has seven electrons in d-subshell?

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Zn

Co

Cu

Fe

Freshly cut metals have a shining surface because

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electrons excited, then excited electrons release energy as light

metals have brittle nature

metals conductivity increases

metals are malleable and ductile

Enthalpy of a system can be calculated by which of following relationship

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q=ΔΕ

q=m×S×∆T

q=pv

q=m×v×∆T

A graph between P and PV constant temperature and number of moles is parallel to:

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Y-axis

X-axis

Z-axis

Pressure axis

A compound X has all of the properties below. It is a liquid at 25°C it mixes completely with water it reaets with aqueous sodium hydroxide, What could X be?

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_{Ethanoic acid}

Ethene

Ethanol

Ethyl ethanoate

Which of the following acid is unsaturated carboxylie acid

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Malonic acid

Oxalic acid

Succinic acid

Maleic acid

The deviation of a real gas from ideal behaviour is maximum at

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-10.0°C and 50 atm

-10°C and 2 atm

100°C and 2.0 atm

0°C and 2 atm

Which of the following molecules has angel of 120°

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BeCl2

BF3

CH4

NH3

Enzymes have been classified on the basis of

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protein structure

prosthetic groups

type of reaction they catalyse

bonding in them

The element with highest E°red

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N

F

O

CI

The reaction kinetics concerned with the

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Rate of reaction

Direction of reaction

Factor effecting rate of reaction

both a &b

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

Number of electrons involved in d-d transition of [Ti(H2O)6]+3

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1

3

2

4

Kinetic energy of one mole of an ideal gas at 300 K in kJ is

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34.8

3.48

3.74

348

An electron with drawing group attached to e-position in phenol

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makes it basic

Stabilises the phenoxide ion

decreases its basicity

allows it to precipitate in aqueous solution

The value of Kc for H2O at 25C° is

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1x10 (-14)mole dm-3

14 mol dm-3

1.86×10(-16) mol dm-3

1.0x10 (-7)moldm-3

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases

At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in

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pressure

No. of moles

Volume

all of these

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

The sun is a ball of plasma heated by nuclear fusion is

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1.0 million km

2.0 million km

1.5 million km

2.5 million km

which of the following d blocks element can showthe highest oxidation number is its ompound

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Chromium

iron

Copper

Manganese

Which one of the following alcohol is indicated by formation of yellow crystals in lodoform tesr?

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Methanol

Ethanol

Butanol

Propanol

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Anthracene contains number of fused benzene rings

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1

2

3

4

The volume of an ideal gas is decreased to half, What will happen to the force exerted on the walls of the container by the gas particles?

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the force is halved

the force increases by a factor of 4

the force remains constant

the force increased by a factory of 2

Which of the following is a base according to lowery Bronsted concept?

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I-1

HCl

H3O+

NH4+1

NH³ shows a maximum boiling point among the hydrides of V-A group elements due to :

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very small size of nitrogen

lone pair of electrons present on nitrogen

enhanced electronegative character of nitrogen

pyramidal structure of NH³