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GS
GS Set-1
Chemistry
Physical Chemistry
170

Physical Chemistry MCQ with Answers

170) The temperature at which the second virial coefficient of a real gas is zero is called:

Critical temperature

Eutectic point

Boiling point

Boyle′s temperature

Answer is:

Boyle′s temperature

Physical Chemistry MCQ with Answers

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Related Physical Chemistry MCQ with Answers

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

a⁄Rb

2a⁄Rb

Rb⁄a

2Rb⁄a

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?

Density

Pressure

KE per mol

RMS speed

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:

Weight of the gas increases with pressure

Speed of the molecules decrease

More number of gas molecules strike the surface per second

Gas molecules attract each other

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:

Is equal to the pressure P

Will be P⁄P = 1

Will be doubled, i.e. 2P

Drops to zero

Answer is:

Drops to zero

Explanation:

Both gases react to give a white solid, NH₄Cl.

Physical Chemistry MCQ with Answers

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