# Give reasons :(a) An increase in temperature is observed on mixing chloroform and acetone.(b) Aquatic animals are more comfortable in cold water than in warm water.

(a) A mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law because of the formation of hydrogen bond between the two.

Therefore, $\Delta H=-ve$

(b) Solubility of $O_{2}$ in water increases with decrease of temperature. It makes aquatic species more comfortable in cold water than in warm water.

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