Question # 1

The volume of a gas that is occupied by its one mole at S.T.P. is known as:

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atomic volume

molar volume

normal volume

total volume

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

If pressure is increased from a 2 atm to 4 atm on a gas then its volume will decrease from:

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3L to 1L

4L to 2L

6L to 4L

8L to 2L

A crystal system in which all three angles and all three edges are different is called

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triclinic

rhombohedral

cubic

hexagonal

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

Zinc reacts with dilute acids to liberate hydrogen. This is because:

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Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

Zine does not show variable oxidation state, because

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Its d-subshell is incomplete

Its d-subshell is complete

It is relatively soft metal

It has two electrons in outermost shell

Glucose and fructose are isomers

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Chain isomers

Position isomers

Functional group isomers

Metamers

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

Elements of group IV-A are

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neither strongly electropositive nor strongly electronegative

strongly electropositive

strongly electronegative

none of these

The hetero atom in py ridine is

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Oxygen

Nitrogen

Chlorine

Sulphur

If 1 mole of an ideal gas is heated from 273.15 K to 283.15 K at 1 atmospheric pressure, then increase in its energy is

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0.082 atm.dm³

0.821 atm.dm³

8.21 atm.dm³

40.6 kJ

The intramolecular forces in gases are:

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Weak.

Normal.

Very weak.

Strong.

The compound that has zero dipole moment is

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HCl

H₂S

NH₃

CH₄

During sudden expansion of a gas energy is needed to overcome the intermolecular:

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Vibrations

Attractions

Repulsions

All of above

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

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Chlorination

Halogenation

Dehydrohalogenation

Hydrogenation

Which of the statement is applicable for both ideal and real gases molecules?

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Have no forces of attraction

Collisions between the molecules is elastic

Molecules are in random movement

The actual volume of gas is negligible as compared to the volume of gas

The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of

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Carbocation

Carbanion

Pentavalent carbon in the transition state

Free radical

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

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zero cm³

546 cm³

446 cm³

346 cm³

In an elimination reaction a more substituted alkene is formed due to the stability associated with

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Free radical

transition state

Activated complex

Carbocation

When a compressed gas is allowed to expand into a region of low pressure, it produce:

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Vapours

Cooling effect

Heating effect

None of above

The shielding effect of inner electron is responsible for

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Having no effect on ionization energy

Decreasing ionization energy

Increasing ionization energy

Increasing electronegativity

Which of the following molecules have a permanent dipole

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CH₄

CHCl₃

CCl₄

CO₂

Combustion analysis is performed for the determination of

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Molar mass of the compound

Empirical formula of the compound

Structural formula of the substance

Mass of halogens present in organic compounds

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

As the number of carbon atoms increases the number of isomers also increase. The 5 C compound pentane has as many as

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3 isomers

5 isomers

6 isomers

10 isomers

Molar mass of formic acid in benzene comes out to be

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64

46

32

92

Which Henderson equation is not correct?

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pH= pKa +log [ salt/acid]

pH = pKa - log [ salt/acid ]

pH= pKa - log[ acid/salt ]

Pka = pH - log [ salt/acid ]

When the concentration of reactants is taken as unity the rate of reaction is equal to

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average rate

concentratian of reactant

instantaneous rate

specific rate constant

The ideal gas law holds best under the conditions of

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high pressure and high temperature

low pressure and high temperature

low pressure and low temperature

high pressure and low temperature

There is more deviation in the behaviour of a gas from the ideal gas equation PV = nRT

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At high temperature and low pressure

At low temperature and high pressure

At high temperature and high pressure

At low temperature and low pressure

The protein component of enzyme ls called

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apoenzyme

proenzyme

holoenyme

co-enzyme

In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their

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Oxidation states

Reduction states

Electrode

Negative charges

Which statement explains why the boiling point of methane is higher than that of neon?

[A_r:H.1:c,12:Ne,20]

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A molecule of methane has a greater mass than a molecule of neon

Molecules of methane form hydrogen bonds but those of neon do not

Molecule of methane have strongel intermolecular forces than those of neon

The molecule of methane is polar, but that of neon is not

In which of the following molecules strongest hydrogen bond is shown

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water

ammonia

hydrogen fluoride

hydrogen sulphide

The synthesis of ethene from ethyl alcohol is a reaction

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Dehydration

Polymerization

Addition

Substitution

The deviation of a gas from ideal behavior is maximum at:

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-10∘C and 5.0 atm

-10∘C and 2.0 atm

100∘C and 2.0 atm

0∘C and 2.0 atm

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

The radioactive disintegration of 238U92 is

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First order

Second order

Third order

Zero order

Which of the following best describes the shape and polarity of the carbon disulphide molecule?

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Bent and polar

Linear and non-polar

Pyramidal and polar

Bent and non-polar

Reaction of alcohol with hydrogen chloride, in the presence of Zinc chloride yields

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Ketone

Carboxylic

Alkyl halide

Ester

Relative acidic strength of alcohol, phenol, water and carboxylie acid is

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Carboxylic acid > Alcohol > Phenol > Water

Carboxylic acid > Phenol > Water> Alcohol

Water > Alcohol> Phenol > Carboxylic acid

Phenol > Carboxylic acid > Alcohol> Water

The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is

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10

1

4

2

The addition compound obtained by reacting acetaldelyde and HCN, when Iydrolyzed gives

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Ethyl alcohol

Methyl cyanide

2-Hydroxy propanoic acid

Ethyl cyanide

Volume of O₂gas at 0°C is 273 cm³, then volume of O₂gas at -10°C is

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263 cm³

163 cm³

173 cm³

73 cm³

Which one of the following is not an alicyclic compound?

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Cyclohexene

Cyclohexane

Benzene

Cyclopentane

A certain buffer solution contains equal cone. of X- and HX. Ka for HX is 10(-8). The pH of buffer is

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3

11

8

14

Ethene can give all of the following reactions except

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Addition

Free radical substitution

Hydrohalogenation

Hydration

Fe+2 is the co-factor for

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Chrome oxidase

Glucose-6-phosphatase

Carbonic anhydrase

Hydrolase

What is the pressure of 2 mole of NH₃ at 27°C when its volume is 5 lit.in Van der Waals equation?(a = 0,17,b = 0.03711)

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10.33 atm

9.333 atm

9.74 atm

9.2 atm

The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

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6.17 x 10^-21 KJ

6.17 x 10^-21 J

6.17 x 10^-20 J

7.16 x 10^-20 J

According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is:

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a constant

fraction

whole number

a multiple

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

The rate of diffusion of a gas is:

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Inversely proportional to its density.

Inversely proportional to square root of its molecules mass.

Directly proportional to molecular mass.

Directly proportional to its density.

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

Enthalpy of neutralization of strong acids and strong bases have same values because

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Neutralization leads to the formation of salt and water

Acids always give rise to H+ and bases always furnish OH-

Strong acids and bases are ionic substances

The net change involves the combination of H and OH ions to form water

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

The strength of dipole-dipole forces depends upon

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Electro negativity difference

Distance between atoms

Electropositivity difference

Both A & B

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

According to kinetic theory of gases kinetic energy depends on

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Temperature

Collision

Pressure

Atomic number

Point out the substance which has maximum vapour pressure at a given temperature?

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Acetone

Water

Ethanol

Acetic acid