Question # 1

When liquid water changes to ice, the volume expands. The expansion in volume is

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5%

7%

9%

12%

The change in enthalpy when one mole of a substance is dissolved in a specified quantity of solvent at a given temperature is called

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Heat of reaction

Heat of solvation

Heat of combustion

Heat of solvent

Which is unnecessary for purification of water for drinking purpose?

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Coagulation

Treatment with iodine

Aeration

Chlorination

A gas has non-ideal behaviour at:

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high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and low pressure

The gases H₂, O₂, H₂S and SO₂diffuse in the order

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SO₂>H₂S>H_2>O₂

H₂S>SO₂>O₂>H₂

O₂>SO₂>H₂>H₂S

H₂>O₂>H₂S>SO₂

The beaker contains slurry of ice and water, the three thermometers Fahrenheit, Kelvin and centigrade placed init. the thermometers are represented as A, B and C respectively, On which thermometer the lowest reading will be?

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B

A

C

both A and B

Fungicides are the pesticides which:

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Kill plants

Kill insects

Kill herbs

Control the growth of fungus

The pressure exerted by gas molecules is due to their

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collisions

densities

masses

kinetic energy

Which sequence of step is correct for the manufacture of cement:

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Crushing, mixing, heating, grinding

Crushing, heating, mixing, grinding

Crushing, grinding, mixing, heating

Mixing, heating, grinding, crushing

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

Fungicides are the pesticides which:

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Control the growth of fungus

Kill insects

Kills plants

Kills herbs

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

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Lowering in b.pt

Reducing viscosity

Reducing specific heat

Lowering in freezing pt

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

Substituted phenyl groups are called

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acyl groups

phenyl groups

Aryl groups

Alkyle groups

Surfactants are organic compounds, used in detergents which reduce the

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Viscosity of water

Surface tension of water

Boiling point of water

Wetting ability of water

The value of activation energy Ea of a reaction can be determined from the value of slope of the straight line obtained by plotting a graph between 1/T and log k. the value of Ea is equal to

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Slope

1/Slope

Slope x R

Slope x 2.303 R

Chlorofluorocarbon, CF₂CI₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Which of the following has polar bond

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O₂

N₂

HCl

Cl₂

An alkynes having Carbon count of 20 is

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gas

liquid

Solid

None

Composition of clay in cement is:

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25%

50%

75%

80%

The largest number of molecules are present in

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3.6 g of H₂O

4.8 g of C₂H₅OH

2.8 g of CO

5.4 g of N₂O₅

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