Chemistry Question Bank

The critical temperature of a substance is defined as :

Statement I critical temperature is the highest temperature at which condensation of a gas is possible. Statement II Critical pressure is the highest pressure at which a liquid will boil when heated Identify the corre…

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…

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…

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

Critical temperature is the

The compressibility factor for an ideal gas is

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.

Positive deviation from ideal behaviour takes place because of

The compressibility factor of an ideal gas is

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

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

At high pressure, all the gases have

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

The compressibility factor (Z) is defined as (a) real ideal V V (b) P Z nRT (c) ideal real V V (d) nRT Z PV

In Van der Waal’s equation of state for a non-ideal gas, the term that accounts for intermolecular forces is

The value of Van der Waal’s constant ‘a’ for the gases O2, N2, NH3 and CH4 are 1.360, 1.390, 4.170 and 2.253L2 atm mol–2 respectively. The gas which can most easily be liquified is

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

For one mole of a vander Waals’ gas when b = 0 and T = 300 K, the PV vs. 1/V plot is shown below. The value of the van der Waals’ constant a (atm L mol–2)

In van der Waals equation of state of the gas law, the constant ‘b’ is a measure of

The units of the van der Waal’s constant ‘b’ are

The units of the van der Waal’s constant ‘a’ are

Van der Waals constants ‘a’ and ‘b’ are related with..... respectively.

a and b are van der Waals constants for gases. Chlorine is more easily liquefied than ethane because

A gas will approach ideal behaviour at