Solubility of a substance which dissolves with a decrease in volume and absorption of heat will be favoured by:

high P and high T

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low P and low T

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high P and low T

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low P and high T

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Solution

The correct option is C high P and high T
During dissolution of a substance, the volume decreases. When pressure is increased, the reaction will proceed in the forward direction which will decrease the volume and nullify the effect of increased pressure.
During the dissolution of a substance, heat is absorbed. Hence, the forward reaction will be favored by high temperature as the effect of increased temperature will be nullified by the absorption of heat.
Hence, the solubility of a substance which dissolves with a decrease in volume and absorption of heat will be favored by high pressure and high temperature.

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