Chemistry Question Bank

A gas is said to behave like an ideal gas when the relation PV/T = constant. When do you expect a real gas to behave like an ideal gas ?

The pressure of real gases is less than that of ideal gas because of

For a gas deviation from ideal behaviour is maximum at :

Any gas shows maximum deviation from ideal gas at

Two separate bulbs contain ideal gases A and B. The density of gas A is twice that of gas B. The molecular mass of A is half that of gas B. The two gases are at the same temperature. The ratio of the pressure of A to …

Dominance of strong repulsive force among the molecules of the gas (Z = compressibility factor)

At high pressure, all the gases have

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

For H2 gas, the compressibility factor, Z = PV/n RT is:

The compressibility factor of an ideal gas is

Positive deviation from ideal behaviour takes place because of

The compressibility factor (Z) is the ratio of I. PV and nRT II. Actual molar volume of gas to molar volume of it. Choose the correct option.

The compressibility factor for an ideal gas is

Critical temperature is the

The liquefaction behavior of the temporary gases like CO2, approaches that of permanent gases like N2, O2 etc., as we go

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the gas particles. Critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respe…

Assertion (A) Gases do not liquefy above their critical temperature even on applying high pressure, Reason (R) Above critical temperature, the molecular speed is high and intermolecular attractions cannot hold the mol…

In a flask of 'V' litres, 0.2 mole of O2, 0.4 mole of N2, 0.1 mole of NH3 and 0.3 mole of He gases are present at 27°C. If total pressure exerted by these non-reacting gases is 1 atm, the partial pressure exerted by N…

If two molecules of A and B have mass 100 kg and 64 kg and rate of diffusion of A is 12 × 10-3, then what will be the rate of diffusion of B? (BCECE 2008)

The term that corrects for the attractive forces present in a real gas in the van der Waals equation is (KCET 2009)

By the ideal gas law, the pressure of 0.60 mole NH3 gas in a 3.0 L vessel at 25°C is (AFMC 2009)

A certain mass of the oxygen gas occupies 7 L volume under a pressure of 380 mm Hg. The volume of the same mass of the gas at standard pressure, with temperature remaining constant, shall be (UP CPMT 2009)

8.2L of an ideal gas weighs 9.0g at 300 K and 1 atm pressure. The molecular mass of the gas is (Manipal 2009)

The ratio of rates of diffusion of helium and methane under same conditions of temperature and pressure will be (CG PMT, Haryana PMT 2009)

If the ratio of the rates of diffusion of two gases A and B is 4 : 1, then the ratio of their densities in the same order is (J&K CET 2009)