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States of Matter: Gases and Liquids
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States of Matter: Gases and Liquids

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Q 1. Rate of diffusion of a gas is:

directly proportional to its density.

directly proportional to its molecular weight.

directly proportional to the square root of its molecular weight.

inversely proportional to the square root of its molecular weight.

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Q 2. {tex} \mathrm { XmL } {/tex} of {tex} \mathrm { H } _ { 2 } {/tex} gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is:

10 seconds : {tex} \mathrm { He } {/tex}

20 seconds : {tex} \mathrm { O } _ { 2 } {/tex}

25 seconds : {tex} \mathrm { CO } {/tex}

55 seconds : {tex} \mathrm { CO } _ { 2 } {/tex}

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Q 3. A gas will approach ideal behaviour at

low temperature and low pressure.

low temperature and high pressure.

high temperature and low pressure.

high temperature and high pressure.

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Q 4. At {tex} 100 ^ { \circ } \mathrm { C } {/tex} and {tex} 1 \mathrm { atm } , {/tex} if the density of liquid water is {tex} 1.0 \mathrm { g } \mathrm { cm } ^ { - 3 } {/tex} and that of water vapour is {tex} 0.0006 \mathrm { g } \mathrm { cm } ^ { - 3 } , {/tex} then the volume occupied by water molecules in {tex}1{/tex} litre of steam at that temperature is

{tex} 6 \mathrm { cm } ^ { 3 } {/tex}

{tex} 60 \mathrm { cm } ^ { 3 } {/tex}

{tex} 0.6 \mathrm { cm } ^ { 3 } {/tex}

{tex} 0.06 \mathrm { cm } ^ { 3 } {/tex}

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Q 5. A mono-atomic ideal gas undergoes a process in which the ratio of {tex} P {/tex} to {tex} V {/tex} at any instant is constant and equals to {tex} 1 . {/tex} What is the molar heat capacity of the gas

{tex} \frac { 3 R } { 2 } {/tex}

{tex} 2 R {/tex}

{tex}0{/tex}

{tex} \frac { 5 R } { 2 } {/tex}

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Q 6.

The root mean square velocity of an ideal gas to constant pressure varies with density as

The expression of root mean square speed is

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Q 7.

A gas of volume 100 cc is kept in a vessel at pressure 10.4 Pa maintained at temperature . Now, if the pressure is increased to 105 Pa, keeping the temperature constant, then the volume of the gas becomes

10 cc

100 cc

1 cc

1000 cc

Given

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Q 8.

For the non-zero value of the force of attraction between gas molecules, gas equation will be

For

When volume of molecules can’t be neglected,

when

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Q 9.

The compressibility factor for definite amount of van der Waal’s gas at

Now,

Since,

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Q 10.

A 3:2 molar mixture of

Molar ratio of

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Q 11.

Boltzmann constant

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Q 12.

The compressibility factor for an ideal gas is

1.5

1

2

Compressibility factor

For ideal gas,

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Q 13.

At 400 K, the root mean square (rms) speed of a gas

2

4

6

8

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Q 14.

The value of van der Waals constant

The van der Waals constant

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Q 15.

A spherical air bubble is rising from the depth of a lake when pressure is

50%

40%

200%

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Q 16.

If

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Q 17.

For the non-zero volume of the molecules, real gas equation for

Both (b) and (c) are true

For

When volume of molecules can’t be neglected,

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Q 18.

The quantity

Number of molecules in the gas

Mass of the gas

Number of moles of the gas

Translational energy of the gas

Number of molecules

Where

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Q 19.

The SI unit of the coefficient of viscosity is

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Q 20.

A quantity of gas is collected in a graduated tube over the mercury. The volume of the gas at

Effective pressure

Use

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Q 21.

10 s, He

20 s,

25 s, CO

55 s,

For the same volume diffused,

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Q 22.

Equal to that of

Half that of

Twice that of

One-fourth of

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Q 23.

Which expression gives average speed of gas molecules?

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Q 24.

The rate of diffusion of methane at a given temperature is twice that of a gas

64

32

4

8

Or

Or

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Q 25.

Under similar conditions, which of the following gas will have same value of

NO

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