Van der Waal's equation for a gas is stated as, P = nRT V - nb - a n V 2 . This equation reduces to the perfect gas equation, P = nRT V When,

temperature is sufficiently high and pressure is low.

both temperature and pressure are very low.

both temperature and pressure are very high.

temperature is sufficiently low and pressure is high.

EASY

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An ideal gas, obeying kinetic theory of gases cannot be liquefied, because

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Important Questions on States of Matter

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

A gas such as carbon monoxide would be most likely to obey the ideal gas law at:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Given, van der Waal's constant for

{NH}_{3}, H_{2}, O_{2}

and

{CO}_{2}

are respectively

4.17, 0.244, 1.36 and 3.59

. Which one of the following gases is most easily liquefied?

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

The number of statement's, which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from the following is _________.

Question Image

A. Carbon dioxide remains as a gas upto point (b)
B. Liquid carbon dioxide appears at point (c)
C. Liquid and gaseous carbon dioxide coexist between points (b) and (c)
D. As the volume decreases from (b) to (c), the amount of liquid decreases

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Among the following, the incorrect statement is:

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Given below are two statement : one is labelled as Assertion $A$ and the other is labelled as Reason $R$ .
Assertion $A : {SO}_{2} (g)$ is adsorbed to a large extent than $H_{2} (g)$ on activated charcoal.

Reason $R$ : ${SO}_{2} (g)$ has a higher critical temperature than $H_{2} (g)$

In the light of the above statements, choose the most appropriate answer from the options given below.

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

In the following compressibility factor (Z) vs pressure graph at 300 K, the compressibility of

C H_{4}

at pressure < 200 bar deviates from ideal behavior because

Question Image

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Which of the following two gases can be cooled from temperature by the Joule-Thomson effect?

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

At very high pressures, the compressibility factor of one mole of a gas is given by:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Given the critical temperature and critical pressure of

{CO}_{2}

gas are

30 ° C

and

72 atm

respectively, find the approximate values of Van der Waals constants

' a'

(in

L^{2} .

atm.

{mol}^{- 2}

) and

' a'

(in L.

{mol}^{- 1}

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Among the following gases, the order of liquefiability is
a) ${SO}_{2}$
b) ${CO}_{2}$
c) ${CH}_{4}$
d) ${NH}_{3}$

HARD

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Van der Waal's equation for a gas is stated as,

P = \frac{nRT}{V - nb} - a {(\frac{n}{V})}^{2}

.

This equation reduces to the perfect gas equation,

P = \frac{nRT}{V}

When,

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

According to Andrews isothermal at what temperature the carbon dioxide gas starts to condense at

73

atmosphere?

HARD

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

If Z is the compressibility factor, then Van der Waal's equation at low pressure can be written as:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

When does a gas deviate the most from its ideal behavior?

HARD

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

One mole of a monoatomic real gas satisfied the equation

p (V - b) = R T

where b is a constant. The relationship of interatomic potential V(r) and interatomic distance r for the gas is given by

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

At a given temperature

T,

gases

N e, A r, X e

and

K r

are found to deviate from ideal gas behaviour. Their equation of state is given as

p = \frac{R T}{V - b}

T .

Here,

b

is the van der Waals constant. Which gas will exhibit steepest increase in the plot of

Z

(compression factor) vs

p ?

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

A gas at

350 K

and

15

bar has a molar volume

20

per cent smaller than that for an ideal gas under the same conditions. The correct option about the gas, and its compressibility factor

(Z)

EASY

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Which of the following gases can be absorbed in more proportion?

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

The critical temperatures of four gases

K, L, M

and

N

are

154.3 K, 5.3 K, 33.2 K

and

126 K

respectively. Which of these gases will liquify first if they start cooling from

500 K

to their critical temperatures?

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquefaction of Gases

Consider the van der Waal's constants,

a

and

b,

for the following gases.

Gas	$A r$	$N e$	$K r$	$X e$
$a / (a t m d m^{6} m o l^{- 2})$	$1.3$	$0.2$	$5.1$	$4.1$
$b / (10^{- 2} d m^{3} m o l^{- 1})$	$3.2$	$1.7$	$1.0$	$5.0$

Which gas is expected to have the highest critical temperature?

An ideal gas, obeying kinetic theory of gases cannot be liquefied, because

Important Questions on States of Matter

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