Chemistry Question Bank

In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm3 at 273 K? (KCET 2010)

If P, V, M, T and R are the symbols of pressure, volume, molecular weight, temperature and gas constant respectively. What is the equation of density of ideal gas? (MPPMT 2010)

Assertion:CH4, CO2 has value of Z (compressibility factor) less than one at 0ºC. Reason :Z < 1 is due to the attractive forces dominate among the molecules.

Assertion: Compressibility factor (Z) for non- ideal gases may be less than or greater than 1. Reason: Non-ideal gases always exert higher pressure than expected.

Assertion: For a real gas, the gas pressure is always less than the pressure calculated from kinetic theory of gases. Reason: In kinetic theory, both molecular volumes and intermolecular attractions were ignored.

Assertion :According to kinetic theory of gases, gas molecules occupy some space. Reason :Gases can be liquefied and solidified.

Assertion :Kinetic energy and momentum of ideal gas molecules are conserved during intermolecular collision. Reason :Collision among real gas molecules is inelastic.

Assertion: A lighter gas diffuses more rapidly than a heavier gas. Reason: At a given temperature, the rate of diffusion of a gas is inversely proportional to the density.

Assertion: According to Charles’ law, for a give amount of an ideal gas at a given pressure, plot of gas volume versus absolute temperature is a straight line passing through origin. Reason: Gaseous volume never vanis…

Assertion :For a given amount of an ideal gas, a plot of pressure (p) versus (1/V) is a straight line at a constant temperature. Reason :A given amount of an ideal gas at a constant temperature obeys Boyle’s law.

Assertion : The pressure of a gas is inversely proportional to the volume at constant temperature and n. Reason : The gas volume is directly proportional to n at constant temperature and pressure.

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases Gases : H2 He O2 N2 Critical tem…

The temperature at which 28 g of N2 will occupy a volume of l0.0 L at 2.46 atm is (RPMT 2010)

By what factor does the average velocity of a gaseous molecule increases, when the temperature (in kelvin) is doubled? (CBSE AIPMT 2011)

The weight of CH4 in a 9-L cylinder at 27oC temperature and 16 atm pressure is (R = 0.0821 L atm K–1 mol–1)

For an ideal gas ratio of P d is equal to:

If P, V, M, T and R are pressure, volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by

The density of a gas at 27oC and 1 atm is d. Pressure remaining constant at which of the following temperatures will its density become 0.75 d?

Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1 mole litre–1 ? (R = 0.082 litre atm mol–1 deg–1)

The density of gas A is four times that of gas B. If the molecular weight of A is M, then at same pressure and temperature molecular weight of B is

The density of CCl4 vapour at 0ºC and 76 cm Hg in g/litre is:

The pressure of sodium vapour in a 1.0 L container is 10 torr at 1000ºC. How many atoms are in the container?

Dry ice is solid carbon dioxide. A 0.050 g sample of dry ice is placed in an evacuated 4.6 L vessel at 30ºC. Calculate the pressure inside the vessel after all the dry ice has been converted to CO2 gas.

The closed containers of the same capacity and at the same temperature are filled with 44g of H2 in one and 44g of CO2 in the other. If the pressure of carbon dioxide in the second container is 1 atm. That of hydrogen…

For an ideal gas, number of moles per litre in terms of its pressure P, temperature T and gas constant R is