1. The compressibility factor for an ideal gas is

a) 1.5

b) 1.0

c) 2.0

d) \[\propto\]

Discussion

Explanation: Ideal gas strictly follows PV= nRT, Z = \[\frac{PV}{nRT} \] = 1

2. A gas will approach ideal behaviour at

a) low temperature and low pressure

b) low temperature and high pressure

c) high temperature and low pressure

d) high temperature and high pressure

Discussion

Explanation: Ideal behaviour at low P and high temperature. The larger the volume the lesser are the interactions, higher the temperature the more is KE the lesser are interactions between the molecules.

3. The compressibility of a gas is less than unity at STP. Therefore

a) \[V_{m}>22.4 litres\]

b) \[V_{m}<22.4 litres\]

c) \[V_{m}=22.4 litres\]

d) \[V_{m}=44.8 litres\]

Discussion

Explanation: Z = \[\frac{PV}{nRT} \] < 1

nRT > PV

1*0.0821*273 > 1*V or V < 22.4

4. An ideal gas will have maximum density when

a) P = 0.5 atm, T = 600 K

b) P = 2 atm, T = 150 K

c) P = 1 atm, T = 300 K

d) P = 1 atm, T = 500 K

Discussion

Explanation: Higher P lower T greater the density

5. 120 g of an ideal gas of molecular weight \[40 g mol^{-1}\] are confined to a volume of 20 L at 400 K. Using R=0.0821 L atm
\[K^{-1}mol^{-1}\] , the pressure of the gas is

a) 4.90 atm

b) 4.92 atm

c) 5.02 atm

d) 4.96 atm

Discussion

Explanation:

6. The volume of 0.0168 mol of \[O_{2}\] obtained by decomposition of \[KClO_{3}\] and collected by displacement of water is 428 ml at a pressure of 754 mm Hg at 25^{0} C. The pressure of water vapour at 25^{0} C is

a) 18 mm Hg

b) 20 mm Hg

c) 22 mm Hg

d) 24 mm Hg

Discussion

Explanation:

7. Pressure of a mixture of 4 g of \[O_{2}\] and 2 g of \[H_{2}\] confined in a bulb of 1 litre at 0^{0} C is

a) 25.215 atm

b) 31.205 atm

c) 45.215 atm

d) 15.210 atm

Discussion

Explanation:

8. Same mass of \[CH_{4}and H_{2}\] is taken in container, The partial pressure caused by \[H_{2}\] is

a) \[\frac{8}{9}\]

b) \[\frac{1}{9}\]

c) \[\frac{1}{2}\]

d) 1

Discussion

Explanation:

9. There are \[6.02* 10^{22}\] molecules each of \[N_{2},O_{2} andH_{2}\] which are mixed together at 760 mm and 273 K. The mass of
the mixture in grams is

a) 6.02

b) 4.12

c) 3.09

d) 6.2

Discussion

Explanation:

10. The density of air is 0.00130 g/ml. The vapour density of air
will be

a) 0.00065

b) 0.65

c) 14.4816

d) 14.56

Discussion

Explanation: VD of air = mass of 11200cc of air = 11200 × density of air = 11200 × .00130 = 14.56