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:

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191

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:

130

260

180

Answer is:

80

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

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

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

Physical Chemistry MCQ with Answers

For more MCQ's Click Here

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

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

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

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

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: