The entropy change for a spontaneous process is

A change in state involving a decrease in entropy can be spontaneous, only if

A

It is exothermic

B

It is isenthalpic

C

It takes place isothermally

D

It takes place at constant volume

For spontaneous changes in an isolated system (S = entropy)

A

Ds = 0

B

Ds

C

Ds > 0

D

Ds = Constant

High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

A

ΔH = 0 and ΔS = 0

B

ΔH ≠ 0 and ΔS = 0

C

ΔH ≠ 0 and ΔS ≠ 0

D

ΔH = 0 and ΔS ≠ 0

For a spontaneous chemical process, the free energy change is

A

Positive

B

Negative

C

Zero

D

Depends on whether the reaction is exothermic or endothermic

Spontaneous change is one in which there is:

A

A lowering of entropy

B

A lowering of free energy

C

Increase in free energy

D

An increase in Internal energy

Entropy change for an irreversible process taking system and surrounding together is

A

0

B

> 0

C

None of these

For reversible adiabatic process, change in entropy is

A

Maximum

B

Minimum

C

Zero

D

Negative

Entropy change in case of reversible adiabatic process is

A

Minimum

B

Zero

C

Maximum

D

Indeterminate

The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

A

R log_e 4

B

R log₁₀ 4

C

C_v log₁₀ 4

D

C_v log_e 4

In any spontaneous process, the __________ free energy decreases.

A

Helmholtz

B

Gibbs

C

Both A & B

D

Neither A nor B

The entropy change for a spontaneous process is

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