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GS
GS Set-1
Chemistry
Physical Chemistry
169

Physical Chemistry MCQ with Answers

169) Oxygen gas is collected by downward displacement of water in a jar. The level of water inside the jar is adjusted to the height of water outside the jar. When the adjustment is made, the pressure exerted by oxygen is equal to:

Atmospheric pressure

Vapour pressure of oxygen at that temperature

Atmospheric pressure plus aqueous tension at that temperature

Atmospheric pressure minus aqueous tension at that temperature

Answer is:

Atmospheric pressure minus aqueous tension at that temperature

Explanation:

P (dry O₂) + P (water vapour) = P (wet O₂)

Physical Chemistry MCQ with Answers

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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

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.

Physical Chemistry MCQ with Answers

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169) Oxygen gas is collected by downward displacement of water in a jar. The level of water inside the jar is adjusted to the height of water outside the jar. When the adjustment is made, the pressure exerted by oxygen is equal to:

Atmospheric pressure minus aqueous tension at that temperature

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

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

Boyle′s temperature

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

a⁄Rb

172) If for two gases of molecular weights MA and MB at temperature TA and TB , TAMB = TBMA, then which property has the same magnitude for both the gases?

RMS speed

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:

More number of gas molecules strike the surface per second

Physical Chemistry MCQ with Answers

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

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?