Thermodynamics Test

Result

Thermodynamics Test - 4

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Question 1
1 / -0

When a solid changes into liquid, the entropy

A
becomes zero

B
becomes minimum

C
increases

D
remains constant

Solution

When a solid changes into liquid, the entropy increases because liquid molecules have greater randomness.
Question 2
1 / -0

In a reversible process, ΔS_sys + ΔS_surr is

A
> 0

B
< 0

C
≥0

D
= 0

Solution

In a reversible process, ΔS_sys + ΔS_surr is equal to zero.
Question 3
1 / -0

The following question has four choices out of which ONLY ONE is correct.

Dissolution of ammonium chloride in water is an endothermic change. At constant temperature, it is accompanied by

A
no change in enthalpy

B
decrease in entropy

C
no change in entropy

D
increase in entropy

Solution

Entropy in liquid state is more than that in solid state. So, dissolution of ammonium chloride in water is accompanied by increase in entropy.
Question 4
1 / -0

Identify the correct statement for change of Gibbs energy for a system (ΔG_system) at constant temperature and pressure.

A
If ΔG_system = 0, then the system has attained equilibrium.

B
If ΔG_system = 0, then the system is still moving in a particular direction.

C
If ΔG_system > 0, then the process is not spontaneous.

D
None of these

Solution

In the alternatives, (3) is most confusing as when ΔG > 0, the process may be spontaneous when it is coupled with a reaction whose ΔG < 0 and total ΔG is negative.