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GS
GS Set-1
Chemistry
Physical Chemistry
194

Physical Chemistry MCQ with Answers

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

Physical Chemistry MCQ with Answers

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Related 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:

−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

197) If at 298 K, the bond energies of C−H, C−C, C=C and H−H bonds are 414, 347, 615 and 435 KJ⁄mol respectively. The value of enthalpy change for the reaction H₂C=CH₂ (g) + H₂ (g) → H₃C−CH₃ (g) at 298 K will be:

+250 kJ

−250 kJ

+125 kJ

−125 kJ

Answer is:

−125 kJ

198) The internal energy change when a system goes from A to B is 40 kJ⁄mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy?

40 kJ

> 40kJ

< 40 kJ

Zero

Answer is:

Zero

Explanation:

ΔE = 0, in a cyclic process.

Physical Chemistry MCQ with Answers

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