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Question

The thermodynamic parameters for the mixing of benzene and naphthalene are:


A
ΔG is positive
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B
ΔSsystem is positive
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C
ΔSsurrounding is zero
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D
ΔH is zero
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Solution

The correct options are
B ΔSsystem is positive
C ΔSsurrounding is zero
D ΔH is zero
Benzene and naphthalene form ideal solution. 
For an ideal solution, since A-A interactions and B-B interactions are equal hence ΔH, change in enthalpy is zero and no heat is absorbed or released.

Entropy of the system increases due to mixing.

Free energy is given by,
ΔG=ΔHTΔSsystem
Since ΔH is zero, ΔSsystem is positive, so free energy is negative.


Since ΔH is zero, 
ΔSsurrounding=ΔHT=0

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