1
MCQ (Single Correct Answer)

AIPMT 2000

The entropy change in the fusion of one mole of a solid melting at 27oC (latent heat of fusion is 2930 J mol–1) is :
A
9.77 J/mol-K
B
10.77 J/mol-K
C
9.07 J/mol-K
D
0.977 J/mol-K

Explanation

$$\Delta S = {{\Delta H} \over T}$$

= $${{2930} \over {300}}$$

= 9.77 J/mol-K
2
MCQ (Single Correct Answer)

AIPMT 2000

Cell reaction is spontaneous when
A
$$\Delta $$Go is negative
B
$$\Delta $$Go is positive
C
$$\Delta $$Eored is positive
D
$$\Delta $$Eored is negative

Explanation

For spontaneous reaction $$\Delta $$Go = – ve and

Eocell = + ve

as $$\Delta $$Go = – nFEocell

where, n = number of electrons taking part

Eo = emf of cell

F = Faraday constant

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