Question # 1

The rate diffusion of H₂is 4 times than the of an unknown gas at same temperature and pressure, the molecular mass of unknown gas is

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32

16

4

64

The starting substance for the preparation of iodoform is any of the following, except

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СН3СН(ОН)CН3

CH3CH2ОН

HCH2OH

CH3COCH3

In solid, the temperature is the measure of:

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Rotational kinetic energies.

Translational kinetic energies.

Vibrational kinetic energies.

None of above.

For a chemical reaction to occur

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The vessel shall be open

Reacting molecules should have less energy than Ea at time of collision

Reacting molecules must be properly oriented and energy more than or equal to Ea

The reacting molecules must not collide with each other

The highest temperature above which a gas cannot be liquified no matter how much pressure is applied, is called as

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critical temperature

absolute zero

liquefaction temperature

boiling point

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

Which one of the following is co-polymer

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PVC

PVA

Polystyrene

Terylene

Which of the following alcohol is more soluble in H2O

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Propanol

Butanol

Pentanol

Hexanol

The word paper is derived form the name of which reedy plant:

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rose

sun flower

papyrus

water hyacinth

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

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

When the rate of formation of reactants is equal to the rate of formation of products, this is known as

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Chemical reaction

Chemical equilibrium

Chemical kinetics

None

Which one of the following substance is no used as drying agent in desiccators

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Silica gel

CaCl₂

Phosphorous

NaCL(50%)

Equal volumes of 0.1 M AgNO₃and 0.2 M NaCl are mixed. The concentration of NO^-₃ions in the mixture will be

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0.1 M

0.05 M

0.2 M

0.15 M

Picric acid is

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2, 4, 6-Trinitrotoluene

2, 4, 6-Tribomoethanol

2, 4,6-Trinitrophenol

Para-Nitrophenol

Which reaction produces a free radical

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SN reaction

Homelytic fission reaction

Heterolytic fission reaction

Addition reaction

In the atmosphere, O₂is about

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10%

15%

21%

25%

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2-bromonitrobenzene

2-nitrobromobenzene

1-bromonitrobenzene

1-nitrobromobenzene

Phenol is also known as

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Acetic acid

Carbolic acid

Tararic acid

Trichloroacetic acid

Solution which distill without change in composition or temperature are called

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Amorphous

Azeotropic mixture

Ideal

Super saturated

The electrophile in aromatic sulphonation is

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H₂SO₄

HSO₄

SO₃

SO₃⁺

All reactions occur in :

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A single step.

A series of steps

Two steps.

Both (a) and (b)

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