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Question

Which of the following is correct for a solution showing positive deviation?
Here,
ΔHmix is the enthalpy of mixing.
ΔGmix is the gibbs free energy of mixing.

A
ΔHmix>0,ΔGmix>0
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B
ΔHmix>0,ΔGmix<0
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C
ΔHmix<0,ΔGmix>0
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D
ΔHmix<0,ΔGmix<0
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Solution

The correct option is B ΔHmix>0,ΔGmix<0
Positive deviation:
Solvent-solute interaction is less than the solvent-solvent and the solute-solute interactions

For positive deviation:

ΔHmix>0
ΔSmix>0
ΔGmix<0
Examples: Ethanol and Acetone, CS2 and acetone

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