Chemistry Question Bank

If the pressure is tripled and temperature (in kelvins) is halved, the volume of a given mass of an ideal gas becomes

How many O₂ molecules are present in 2.0 L of oxygen gas at 27 °C temperature and 3.0 atm pressure ?

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

X ml of H₂ gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical condition is

50 ml of gas A diffuses through a membrane in the same time as for the diffusion of 40 ml of a gas B under identical pressure- temperature conditions. If the molecular weight of A is 64 that of B would be

Indicate which of the following statements are correct.

At the same temperature and pressure, which of the following gases will have the highest kinetic energy per mole ?

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

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

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

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

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…

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

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: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.

For V versus T plot at constant pressure P₁ and P₂ for an ideal gas is given in adjoining figure. Which of the following relation is correct ?

Calculate the number of moles in the glass bulb shown in figure at 300 K. Given : density of glycerine = 2.72 g/mL; density of mercury = 13.6g/mL

Among the plots of P versus V, as given below, which one corresponds to Boyle’s law ? (a) (b) (c) (d)

Which of the following is a correct plot of the volume of fixed amount of ideal gas as a function of temperature (at constant pressure) ? (a) (b) (c) (d)

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.

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

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.