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Question

Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statements are:
(i) ΔG is positive (ii) ΔSsystem is positive
(iii) ΔSsurroundings=0
(iv) ΔH=0

A
(ii) and (iv) only
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B
(i) and (iii) only
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C
(ii), (iii) and (iv) only
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D
all of these
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Solution

The correct option is D (ii), (iii) and (iv) only

For an ideal solution with spontaneous process, according to Raoult's law, for an ideal solution

ΔH=0

ΔVmix=0

Since there is no exchange of the heat energy between system and surroundings

ΔSsurroundings=0

Thus ΔSsys=+ve

Now, from the relation

ΔG=ΔHTΔS

ΔG will be –ve.

So, ii, iii and iv are correct.

The correct option is C.


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