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Chemistry Fsc Part 1 Chapter 3 Online Test MCQs With Answers

Question # 1

For a gas obeying Boyle's law if pressure is doubled, the volume becomes.

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Double

One half

Four times

Remains constant

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Question # 2

The rate of diffusion of a gas of molar mass 72 as compared to H2 will be.

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1/6 times

1.4 times

6 times

same

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Question # 3

The free expansion of the gas from high pressure towards the low pressure causes

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Increase of temperature

Decrease of temperature

Grater number of collisions among the molecules

Decrease of velocity of gas molecules

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Question # 4

Which mixture of gases is used by the deep sea divers.

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Oxygen and nitrogen

Oxygen and helium

Oxygen and carbon di oxide

Oxygen and water vapours

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Question # 5

What are the SI units of Van der Waal constant 'a'

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atm dm3 mol-2

atm dm6 mol-2

Nm4 mol-2

Nm mol-1

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Question # 6

At which distance a molecule is present from its neighbor molecules of its own diameter, at room temperature.

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100 times

200 times

300 times

400 times

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Question # 7

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

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Boiling temperature

Consulate temperature

Absolute zero

Critical temperature

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Question # 8

Critical temperature of CO2 gas is.

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31.1 ^oC

13.1 K

13.1 ^oC

1.31 ^oC

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Question # 9

Which one of the following gases cannot be liquefied by Line's method.

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Water vapours

NH3

Nitrogen

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Question # 10

Noon has low critical temperature and pressure as compared to other gases. the most probable reason is that

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Its octet is complete

It is a monoatomic gas

It has very low polarizability

It has least forces of attraction

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