Which of the following binary mixtures will have the same composition in the liquid and the vapour phase?
| (a) | Benzene-toluene | (b) | Water-nitric acid |
| (c) | Water-ethanol | (d) | n-Hexane-n-heptane |
| 1. | a and b | 2. | b and c |
| 3. | c and d | 4. | a and d |
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