Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
A solution containing components A and B exhibits positive deviation from Raoult?s law only when (1) \[\Delta {{V}_{mixing}}=+ve\] (2) \[\Delta {{H}_{mixing}}=-ve\] (3)\[A-B\]attraction forces\[<A-A\]and\[B-B\] attraction forces. (4)\[A-B\]attraction forces\[>A-A\]and\[B-B\] attraction forces.A) 1, 2 and 3 are correct.
B) 1 and 2 are correct.
C) 2 and 4 are correct.
D) 1 and 3 are correct.
Correct Answer: D
Solution :
When the\[AB\]interaction are weaker than the\[AA\]and\[BB\]interaction, then solution exhibits positive deviation from Raoult?s law. For such solutions AH mixing is positive because energy is required to break\[AA\] or\[BB\] attractive forces. On mixing, because the magnitude of intermolecular forces in solution decreases, thus the molecules will be loosely held, hence volume increases ie,\[\Delta {{V}_{mixing}}=+ve\]
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