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Question Bank No: 2

1. If rate of diffusion of A is 5 times that of B, what will be the density ratio of Aand B ?

a)		$\frac{1}{25}$
b)		$\frac{1}{5}$
c)		25
d)		5

2. 3.2 g of oxygen(At.wt. = 16) and 0.2g of hydrogen (At.wt. = 1) are placed in a 1.12 L FLASK AT $0^{\circ} C$ . The total pressure of the gas mixture will be

a)		1 atm
b)		4 atm
c)		3 atm
d)		2 atm

3. There is more deviation in the behaviour of a gas from the ideal gas equation PV = nRT

a)		at high temperature and low pressure
b)		at low temperature and high pressure
c)		at high temperature and high pressure
d)		at low temperature and low pressure

4. The V.D. of a gas is 11.2. The volume occupied by 11.2g of this gas at N.T.P. is

a)		22.4 litres
b)		11.2 litres
c)		1 litre
d)		2.24 litres

5. Wt. of 112 ml of oxygen at NTP on liquification would be

a)		0.32g
b)		0.64g
c)		0.16g
d)		0.96g

6. Since the atomic weights of carbon, nitrogen and oxygen are 12, 14 and 16 respectively, among the following pairs of gases, the pair that will diffuse at the same rate is

a)		Carbon dioxide and nitrous oxide
b)		Carbon dioxide and nitrogen peroxide
c)		Carbon dioxide and carbon monoxide
d)		Carbon dioxide and nitric oxide

7. The relative rates of diffusion of a gas (Mol. wt. = 98) as compared to hydrogen will be

a)		$\frac{1}{7}$
b)		$\frac{1}{5}$
c)		$\frac{1}{4}$
d)		$1$

8. The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on

a)		Pressure of the gas
b)		Temperature of the gas
c)		Volume of the gas
d)		Pressure , temperature and volume of the gas

9. Two moles of an ideal gas at 1 atm are compressed to 2atm at 273 K. The enthalpy change for the process is

a)		2 litre atm
b)		1 litre atm
c)		zero
d)		3 litre atm

10. Value of universal gas constant 'R' depends upon

a)		temperature of the gas
b)		volume of gas
c)		number of moles of gas
d)		none of these

11. The volume of 2.8 g of carbon monoxide at $27^{\circ} C$ and 0.821 atm pressure is (R = 0.0821 lit.atm. ${mol}^{- 1} K^{- 1}$ )

a)		30 L
b)		3 L
c)		0.3 L
d)		1. 5 L

12. Van der Waal equation is true for

a)		Ideal gas
b)		Real gas
c)		Gaseous substance
d)		None of the above

13. The temperature of the gas is raised from $27^{\circ} C$ to $927^{\circ} C$ , the root mean square velocity is

a)		$\sqrt{927 / 27}$ times the earlier value
b)		same as before
c)		halved
d)		doubled

14. An ideal gas cannot be liquified because

a)		its critical temperature is always above $0^{\circ} C$
b)		its molecules are relatively small in size
c)		it solidifies before becoming a liquid
d)		forces operative between its molecules are negligible

15. 50 ml of a gas A diffuse through a membrane in the same time as for the diffusion of 40 ml of a gas B under identical pressure temperature conditions. If the molecular weight of A = 64, that of B would be

a)		100
b)		250
c)		200
d)		80

16. A real gas most closely approaches the behavior of an ideal gas at

a)		15 atm. and 200 K
b)		1 atm. and 273 K
c)		0.5 atm. and 500 K
d)		15 atm. and 500 K

17. At the same temperature and pressure which of the following gas will have highest K.E. per mole

a)		Hydrogen
b)		Oxygen
c)		Methane
d)		All the above

18. According to kinetic theory of gases there are

a)		intermolecular attractions
b)		molecules which have considerable volume
c)		no intermolecular forces of attraction
d)		the velocity of molecules decreases for each collision

19. Which of the following contains the same number of atoms as 12g of magnesium? (At mass Mg = 24, C =12, Ca = 40)

a)		12 g of C
b)		20 g of Ca
c)		24 g of C
d)		40 g of Ca

20. 20 litres of hydrogen gas weigh about

a)		12.2 g
b)		44.8 g
c)		1.8 g
d)		20 g

21. "One gram molecule of a gas at N.T.P. occupies 22.4 litres." This fact was derived from

a)		Dalton's theory
b)		Avogadro's hypothesis
c)		Berzelius hypothesis
d)		Law of gaseous volume

22. If 4g of oxygen diffuse through a very narrow hole, how much hydrogen would have diffused under identical conditions

a)		16 g
b)		1 g
c)		1/4 g
d)		64 g

23. The vapour density of a gas is 35.5. The volume occupied by 3.55 g of the gas at N.T.P. is

a)		1.12 litres
b)		11.2 litres
c)		22.4 litres
d)		44.8 litres

24. The rate of diffusion of hydrogen is about

a)		$\frac{1}{2} th$ of Helium
b)		1.4 times that of Helium
c)		twice that of Helium
d)		four times that of Helium

25. Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A < B < C ?

a)		B evaporates more readily than A
b)		B evaporates less readily than C
c)		A and B evaporates at the same rate
d)		A evaporates more readily than C