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GS
GS Set-1
Chemistry
Physical Chemistry
192

Physical Chemistry MCQ with Answers

192) For a spontaneos process, the values of free energy and entropy change are respectively:

Positive and negative

Negative and Positive

Positive and positive

Negative and negative

Answer is:

Positive and negative

Explanation:

In a spontaneous process, entropy increases and free energy decreases.

Physical Chemistry MCQ with Answers

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193) Which one of the following has the maximum entropy of vapourisation?

Water

Toluene

Diethyl ether

Acetone

Answer is:

Diethyl ether

194) The free energy change is negative when:

The surroundings do no electrical work on the system

The surroundings do electrical work on the system

The system does electrical work on the surroundings

The system does no electrical work on the system

Answer is:

The system does electrical work on the surroundings

195) The heat liberated on complete combustion of 7.8 gm benzene is 327 kJ. The heat was measured at constant volume at 27^oC. Calculate the heat of combustion of benzene at constant pressure:

−3274 kJ⁄mol

−1637 kJ⁄mol

−3270 kJ⁄mol

−3637 kJ⁄mol

Answer is:

−3270 kJ⁄mol

196) The standard heat of combustion of Al is −837.8 kJ⁄mol at 25^oC. If Al reacts with O₂ at 25^oC, which of the following releases 250 kcal of heat?

The reaction of 0.312 mol of Al

The formation of 0.624 mol of Al₂O₃

The reaction of 0.712 mol of Al

The formation of 0.615 mol of Al₂O₃

Answer is:

The formation of 0.624 mol of Al₂O₃

Physical Chemistry MCQ with Answers

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192) For a spontaneos process, the values of free energy and entropy change are respectively:

Positive and negative

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

193) Which one of the following has the maximum entropy of vapourisation?

Diethyl ether

194) The free energy change is negative when:

The system does electrical work on the surroundings

195) The heat liberated on complete combustion of 7.8 gm benzene is 327 kJ. The heat was measured at constant volume at 27oC. Calculate the heat of combustion of benzene at constant pressure:

−3270 kJ⁄mol

196) The standard heat of combustion of Al is −837.8 kJ⁄mol at 25oC. If Al reacts with O2 at 25oC, which of the following releases 250 kcal of heat?

The formation of 0.624 mol of Al2O3

Physical Chemistry MCQ with Answers

195) The heat liberated on complete combustion of 7.8 gm benzene is 327 kJ. The heat was measured at constant volume at 27^oC. Calculate the heat of combustion of benzene at constant pressure:

196) The standard heat of combustion of Al is −837.8 kJ⁄mol at 25^oC. If Al reacts with O₂ at 25^oC, which of the following releases 250 kcal of heat?

The formation of 0.624 mol of Al₂O₃