Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

171) The inversion temperature (T_i) for a gas is given by:

Answer is:

a⁄Rb

172) If for two gases of molecular weights M_A and M_B at temperature T_A and T_B , T_AM_B = T_BM_A, then which property has the same magnitude for both the gases?

Answer is:

RMS speed

Explanation:

T_i = 2a⁄Rb

173) Certain volume of a gas exerts on its walls some pressure at a particular temperature. It has been found that by reducing the volume of gas to half of its original value, the pressure becomes twice that of the initial value at constant temperature. This happens because:

Answer is:

More number of gas molecules strike the surface per second

Explanation:

Collision frequency increases when molecules come closer to each other.

174) If a vessel containing hydrogen chloride at a pressure P is connected with another vessel of the same volume containing ammonia at a pressure P and the connecting tube opened so that they can mix and form a white solid, then the gas pressure:

Answer is:

Drops to zero

Explanation:

Both gases react to give a white solid, NH₄Cl.

175) A balloon filled with methane is pricked with a sharp point and quickly plunged into a tank of hydrogen at the same pressure. After sometime, the balloon will have:

Answer is:

Enlarged

Explanation:

Rate of diffusion of hydrogen is greater than that of methane.

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