For a certain reaction, the change in enthalpy and the change in entropy are 40.63 kJ⁄mol and 100 J⁄K. What is the value of ΔG at 27<sup>o</sup>C? Also, indicate whether the reaction is possible or not.

+10630 J⁄mol; not possible

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190

Physical Chemistry MCQ with Answers

190) For a certain reaction, the change in enthalpy and the change in entropy are 40.63 kJ⁄mol and 100 J⁄K. What is the value of ΔG at 27^oC? Also, indicate whether the reaction is possible or not.

+10630 J⁄mol; possible

+10630 J⁄mol; not possible

−7990 J⁄mol; possible

+7990 J⁄mol; possible

Answer is:

+10630 J⁄mol; not possible

Physical Chemistry MCQ with Answers

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191) The bond dissociation energies of methane and ethane are 360 kcal⁄mol and 620 kcal⁄mol respectively. The C−C bond energy in kcal⁄mol is:

130

260

180

Answer is:

80

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.

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

Physical Chemistry MCQ with Answers

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190) For a certain reaction, the change in enthalpy and the change in entropy are 40.63 kJ⁄mol and 100 J⁄K. What is the value of ΔG at 27oC? Also, indicate whether the reaction is possible or not.

+10630 J⁄mol; not possible

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

191) The bond dissociation energies of methane and ethane are 360 kcal⁄mol and 620 kcal⁄mol respectively. The C−C bond energy in kcal⁄mol is:

80

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

Positive and negative

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

Physical Chemistry MCQ with Answers

190) For a certain reaction, the change in enthalpy and the change in entropy are 40.63 kJ⁄mol and 100 J⁄K. What is the value of ΔG at 27^oC? Also, indicate whether the reaction is possible or not.