Chemistry Question Bank

Pure hydrogen sulphide is stored in a tank of 100 litre capacity at 20ºC and 2 atm pressure. The mass of the gas will be

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:

Assertion :Above critical temperature liquid state cannot be observed. Reason :Above critical temperature, the average kinetic energy of a molecule is always greater than the maximum kinetic energy a molecule can poss…

Assertion :Gases do not liquefy above their critical temperature, whatever the high pressure is applied. Reason :Above critical temperature, molecular speed is high and intermolecular force cannot hold the molecules t…

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…

NH3 can be liquefied at ordinary temperature without the application of pressure. But O2 cannot, because

For NH3 gas Z < 1. So the volume occupied by one mole of NH3 (Vm) at STP is

Five grams each of the following gases at 87oC and 750 mm pressure are taken. Which of them will have the least volume ?

Above graph is plotted for CO2 at three different temperature i.e., 273K, 1273 K and 2773 K. Which of the following option is correct about these temperatures? T1 T2 T3 (a) 273 K 1273 K 2773 K (b) 2773 K 1273 K 273 K …

At what temperature will the average speed of CH4 molecules have the same value as O2 has at 300 K?