**By**May 22, 2023

**buzzerkings**

GASES

1 / 72

van dar Waals 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,

2 / 72

Chlorine is more easily liquefied than ethane because ('a' and 'b' are van dar Waals constants for gases).

3 / 72

In van dar Waals equation of state of the gas law, the constant 'b' is a measure of:

4 / 72

The term that corrects for the attractive forces present in a real gas in the van der Waal's equation is:

5 / 72

The compressibility factor Z=(PV/RT) for 1 mol of a real gas is greater than unity at a pressure of 1 atm and 273.15 K. The molar volume of the gas at STP will be:

6 / 72

An ideal gas obeying kinetic gas equation can be liquefied if:

7 / 72

Negative deviation from ideal behavior is due to the fact that:

8 / 72

The compressibility factor (Z) for a real gas at high pressure is:

9 / 72

For an ideal gas, number of moles per dm³ in terms of its pressure P, gas constant 'R' and temperature 'T' is:

10 / 72

The initial volume of a gas cylinder is 750.0 cm³, If the pressure of gas inside the cylinder changes from 840.0 mm Hg to 360.0 mm Hg, the final volume of the gas will be:

11 / 72

Which of the following is absolute temperature?

12 / 72

A gas has a volume of 3.86 dm³ at a temperature) of 45°C. What will the volume of gas be if its temperature is raised to 80°C, while its pressure is kept constant?

13 / 72

According to kinetic theory of gases in an ideal gas, between two successive collisions' a gas molecule travels:

14 / 72

Kinetic theory of gases proves:

15 / 72

Eight gram each of oxygen and hydrogen at 27°C will have the total kinetic energy in the ratio of:

16 / 72

At what temperature will the total K.E. of 0.3 mol of He be the same as the total K.E. of 0.4 mol of Ar at 400 K?

17 / 72

At constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise to temperature due to:

18 / 72

The root mean square velocity of an ideal gas at constant pressure varies with density(d) as:

19 / 72

The ratio between the root mean square speed of H2 at 50K and that of O2 at 800 K is:

20 / 72

Helium atom is two times heavier than a molecule. At 298 K, the average kinetic hydrogen a helium atom is:

21 / 72

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

22 / 72

Which of the following is not an assumption of the kinetic theory of gases?

23 / 72

According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels

24 / 72

Four gases P.Q.R and S have almost same values of 'b' but their 'a' values (a, b are van dar Waals constants) are in the order Q<R <S < P. At a particular temperature, among the four gases the most easily liquefiable one is

25 / 72

The average K.E per molecule of ideal gas is equal to;

26 / 72

For a gas, which pair of variables are inversely proportional to each other (if all other conditions remain constant)?

27 / 72

Which gas shows the most deviation from ideal behavior?

28 / 72

The perfect example of an ideal gas is:

29 / 72

The compressibility factor of an ideal gas is:

30 / 72

A Van der Waals real gas, acts as an ideal gas, at which conditions?

31 / 72

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

32 / 72

The particles of a gas can be described as:

33 / 72

Excluded volume is ___ times the actual volume of molecules.

34 / 72

For one mole of kinetic energy is given by:

35 / 72

According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels:

36 / 72

If a gas expand at constant temperature:

I.the pressure decreases

II.the kinetic energy of the molecules remains the same

III. the kinetic energy of the molecules decreases

IV.the number of molecules of the gas increase

37 / 72

Under which conditions, real gases deviate from ideal behaviour?

38 / 72

The compressibility factor Z = (pV/RT) for 1 mol of a real gas is greater than unity at a pressure of 1 atm and 273.15 K. The molar volume of the gas at STP will be:

39 / 72

An ideal gas obeying kinetic gas equation can be liquefied if:

40 / 72

The term that corrects for the attractive forces present in a real gas in the van dar Waals equation is

41 / 72

A real gas obeying van der waal's equation will resemble ideal gas of the value of:

42 / 72

Which gas is more ideal at S.T.P?

43 / 72

In van dar Waals equation, the constant b measure of:

44 / 72

For an ideal gas PV = nRT where P and V

represents the total pressure and volume of the gas. If the individual molecules have also their volume and exert inter-molecular attraction then the gas equation needs:

45 / 72

5g H2 gas is confined in 1dm³ container if H₂ were a true ideal gas, how would its behaviour differ from its actual behaviour?

46 / 72

van der Waal's found that the two assumption made by kinetics theory of gases were wrong. One of them is a "The gas molecules are:

47 / 72

The density of a gas is 1.964g dm-3 at 273k and 76cm Hg. The gas is:

48 / 72

The density of helium will be highest at:

49 / 72

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is:

50 / 72

According to Kinetic Molecular theory, K.E of molecules increase when they are:

51 / 72

Which of the following is not an assumption of the kinetic theory of gases?

52 / 72

According to the Kinetic theory of gases, the molecular collisions are elastic. Such collisions cause:

53 / 72

If you double the volume of a constant amount of a gas at a constant temperature, what happens to the pressure?

54 / 72

Which gas sample has the greatest volume at STP?

55 / 72

7.5 grams of a gas occupies 5.6 dm3 of volume at STP. The gas is:

56 / 72

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

57 / 72

A gas has a volume of 3.86 dm³ at a temperature of 45°C. What will the volume of gas be if its temperature is raised to 80°C, while its pressure is kept constant?

58 / 72

A fire extinguisher delivers 2.2 kg of CO2. The volume of CO2 at room temperature is:

59 / 72

Absolute zero is:

60 / 72

Which of the following law can only be explained

on Kelvin scale:

61 / 72

A gas sample at STP contains 1.15g oxygen and 1.15g nitrogen. What is the volume of the gas sample?

62 / 72

Which of the following is an absolute temperature?

63 / 72

A gas has volume and pressure are 1 dm³ and 2atm respectively. What should be its new volume when pressure is increased to 6atm at constant temperature?

64 / 72

The initial volume of a gas cylinder is 750.0 mL. If the pressure of gas inside the cylinder changes from 840.0 mm Hg to 360.0 mm Hg, the final volume of the gas will be:

65 / 72

Mathematically Boyle's law is shown as:

66 / 72

If two moles of an ideal gas at 540K has volume 44.8dm³ then its pressure will be:

67 / 72

The value of proportionally constant 'k' in Boyle's law remains same for:

68 / 72

Value of gas constant R in torr and dm³ is:

69 / 72

Which of the following. have same number of molecules at S.T.P?

70 / 72

The ratio of universal gas constant to the Avogadro's constant represents another constant called:

71 / 72

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will:

72 / 72

For ideal gases isotherm refers to the:

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