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a

When liquid ethanol and water mixed then heat released.

b

For all non-ideal solutions, ${ΔH}_{mix} < 0$

c

Chloroform and acetone form maximum boiling azeotrope.

d

For all non-ideal solutions, ${ΔV}_{mix} > 0$

answer is C.

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Detailed Solution

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(a) Aquatic species are less comfortable ill warm water due to less solubility of oxygen in warm water.
(b) Amalgam of mercury with sodium is an example of solid solution.
(c) CHCl₃ +CH₃COCH₃: -ve deviation from Raoult's law. So they form maximum boiling azeotrope.
(d) C₂H₅H +H₂O : +ve deviation from Raoult's law- so heat absorbed.

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