As e dey HOT, 40 hot Questions from Gas laws (Dr Mais)

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CHEMISTRY IN A CAPSULE

1.Which one of the following statements is wrong for gases?

(a) Gases do not have a definite shape and volume

(b) Volume of the gas is equal to volume of container 

the confining the gas

(c) Confirmed gas exerts uniform pressure on the 

walls of its container in all directions

(d) Mass of gas cannot be determined by weighing a 

container in which it is enclosed

2. Which of the following mixture of gases does not 

obey Dalton’s law of partial pressure?

(a) O2 and CO2

(b) N2and O2

(c) Cl2 and SO2

(d) NH3 and HCl

3. In which of the following pairs, the critical temperature of latter gaseous species is higher than the first?

(a) CO2,  H2 (b) H2,  NH3

(c) NH3,  He (d) CO2 ,He

4. The dimensions of pressure are same as that of:

(a) Energy

(b) Energy per unit volume

(c) Force per unit area

(d) Force per unit volume

5. Ideal gas obeying kinetic theory of gases can be 

liquefied if:

(a) T >Tc

(b) P >Pc

(c) P > Pc and T < Tc

(d) It cannot be liquefied at any value of P and T.

6. Based on kinetic theory of gases, which of the following laws can be proved?

(a) Boyle’s law (b) Charles law

(c) Avogadro’s law (d) All of these

7. According to the kinetic theory of gases, in an ideal gas, between two successive collisions the gas 

molecules travels:

(a) In a circular path

(b) In a wavy path

(c) In a straight line path

(d) With an accelerated velocity

8. Which of the following law leads us to arrive at the conclusion that 1 g-molecule of each gas at STP occupies a volume of 22.4 L?

(a) Dalton’s law

(b) Law of combining volumes

(c) Avogadro’s law

(d) Boyle’s law

9. 0.1 mole of gas absorbs 41.75 J of heat, the rise in temperature occurs 20C, the gas must be:

(a) Triatomic (b) Diatomic

(c) Monoatomic (d) (b) and (c) both

10. Which pair of the gases diffuses with the same rate at same temperature and pressure?

(a) CO and NO (b) NO2 and CO2

(c) NH3 and PH3 (d) NO and C2H6

11. Van der Waals real gas, act as an ideal gas, at which 

condition?

(a) High temperature, low pressure

(b) Low temperature, high pressure

(c) High temperature, high pressure

(d) Low temperature, low pressure

12. The compressibility factor of an ideal gas is:

(a) 1 (b) 2

(c) 4 (d) 0

13. The temperature below which a gas can be made to 

liquefy by variation in pressure is called its:

(a) Inversion temperature

(b) Critical temperature

(c) Neutral temperature

(d) Curie point

14. By the ideal gas law the pressure of 0.60 mol NH3 gas in a 3.00 litre vessel at 25°C is:

(a) 48.9 atm (b) 4.89 atm

(c) 0.489 atm (d) 489 atm

15. At what centigrade temperature will be the volume of a gas at 0°C double of itself, when pressure remains 

constant?

(a) 0°C (b) 273°C

(c) 273 K (d) 546 K

16. Pressure of a mixture of 4 g of O2 and 2 g of H2 confined in a bulb of 1.0 L capacity at 0°C is:

(a) 25.18 atm (b) 31.205 atm

(c) 40.215 atm (d) 15.210 atm

17. A closed container contains equal number of oxygen and hydrogen molecules at a total pressure of 740 mm. If oxygen is removed from the system then pressure will:

(a) Become double of 740 mm

(b) Become half of 740 mm

(c) Become 1/9 of 740 mm

(d) Remain unchanged

18. The volume occupied by 9.0 g of nitrogen gas at 300 K and 750 mmHg pressure is:

(a) 5.854 (b) 6.7432

(c) 8.8462 (d) 8.0225

19. What are the conditions under which the relation 

between volume (V) and number of moles (n) of gas 

is plotted? (P = pressure; T = temperature):

(a) Constant P and T (b) Constant T and V

(c) Constant P and V (d) Constant n and V

20. The rms velocity of CO2 at a temperature T (in Kelvin) is Y cm sec–1. At what temperature (in Kelvin), the rms velocity of nitrous oxide would be 4Y cm sec–1?  (Atomic weights of C, N and O are respectively 12,14 and 16)

(a) 16 T (b) 2T

(c) 4T (d) 32 T

21. ‘n’ moles of an ideal gas at temperature T (in Kelvin) occupy ‘V’ litres of volume, exerting a pressure of ‘P’ atomospheres. What is its concentration (in mol L–1)? (R = gas constant):

(a) P/RT (b) PT/R

(c) RT/P (d) R/PT

22. 7.5 g of gas occupy 5.6 litres of volume at STP. The gas is ……..

(Atomic weight of C, N, and O are 12, 14 and 16 re￾spectively):

(a) NO (b) N2O (c) CO (d) CO2


23. A gas diffuses four times as quickly as oxygen. The molar weight of gas is:

(a) 2 (b) 4

(c) 8 (d) 16

24. Compressibility factor for 1 mol of a van der Waals gas at 0°C and 100 atmospheric pressure is found to be 0.5, the volume of gas molecule is:

(a) 2.0224 L (b) 1.4666 L

(c) 0.8542 L (d) 0.1119 L

25. The density of air is 0.001293 g/cc at STP. Its vapour density is:

(a) 0.001293 (b) 8.2786 (c) 14.48 (d) 6.2706

26. At 27°C, a closed vessel contains a mixture of equal weights of helium (mol. wt. = 4), methane (mol. wt. = 16) and sulphur dioxide (mol. wt. = 64). The pressure exerted by the mixture is 210 mm. If the partial pressures of helium, methane and sulphur dioxide are P1,P2 P2 and P3 respectively, which one of the following is correct?

(a) P3 >P2 > P1 (b) P1 >P2 >P3

(c) P1 >P3 >P2 (d) P2 >P3 > P1

27. 4 g of an ideal gas occupies 5.6035 litres of 

volume at 546 K and 2 atm pressure. What is its molecular weight?

(a) 4 (b) 16(c) 32 (d) 64

28. The kinetic energy of 4 moles of nitrogen gas at 127°C 

is ……. Kcals. (R = 2 cal mol–1 K–1):

(a) 4400 (b) 3200(c) 4800 (d) 1524

29. If a gas contains only three molecules that move with velocities of 100, 200, 500 ms–1, what is the rms velocity of the gas is ms–1?

(a) 100 √8/3 (b) 100√ 30 (c) 100 √10 (d) 800 / 3

30. A gaseous mixture contains 56 g of N2, 44 g of CO2 and 16 g of CH4 . The total pressure of mixture is 720 mm of Hg. The partial pressure of methane is:

(a) 75 mm (b) 160 mm (c) 180 mm (d) 215 mm

31. At 25°C and 730 mm pressure, 380 mL of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occupy at 760 mm pressure?

(a) 365 mL (b) 2 mL(c) 10 mL (d) 20 mL

32. The density of an ideal gas is 0.03 g cm–3, Its pressure is 106 g cm–1 sec–2. What is its rms velocity (in cm sec–1)?

(a) 10³ (b) 3 x 10⁴ (c) 10^8 (d) 10⁴

33. At a certain pressure, volume of a gas at 27°C is 20 litre. If the pressure and temperature are doubled, its volume will be:

(a) 20 litre (b) 40 litre (c) 8.2 litre (d) 10.9 litre

34. A and B are ideal gases. The molecular weights of A and B are in the ratio of 1:4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture?

(a) P/5 (b) P/2 (c) P/2.5 (d) 3P/4

35. A gas has double the average velocity of SO2 gas at any temperature. The gas may be:

(a) CO2 (b) C2H4 (c) CH4 (d) O2

36. If two moles of ideal gas at 540 K has volume 44.8 L, then its pressure will be:

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

37. The densities of two gases are in the ratio of 1:16. The ratio of their rates of diffusion is:

(a) 16:1 (b) 4:1(c) 1:4 (d) 1:16

38. The critical temperature of water is higher than that of O2 because the H2O molecule has:

(a) Fewer electrons than O2

(b) Two covalent bonds

(c) V-shape

(d) Dipole moment

39. If pressure of 2 mol of an ideal gas at 546 K having volume 44.8 litre is:

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

40. A gas behaves most like an ideal gas under conditions of:

(a) High pressure and low temperature

(b) High temperature and high pressure

(c) Low pressure and high temperature

(d) Low pressure and low temperature


Enjoy chemistry like morning coffee! 


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