Q20 / 150 · MHT CET 2023 (11 May Shift 1) · Chemistry

Which among following salts shows decrease in solubility with increase in temperature?

  • Correct answer
    A
    $\mathrm{Na}_2 \mathrm{SO}_4$
  • B
    $\mathrm{KNO}_3$
  • C
    $\mathrm{NaNO}_3$
  • D
    $\mathrm{KBr}$

Solution

Dissolution of $\mathrm{Na}_2 \mathrm{SO}_4$ in water is an exothermic process. When a substance dissolves in water by an exothermic process, its solubility decreases with an increase in temperature. Hence, solubility of $\mathrm{Na}_2 \mathrm{SO}_4$ in water decreases with increase in temperature.

Hence, the correct answer is option: 'A'.

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