A saturated solution of \( \mathrm{XCl}_{3} \) has a vapour pressure \( 17.20 \mathrm{~mm} \math...

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A saturated solution of \( \mathrm{XCl}_{3} \) has a vapour pressure \( 17.20 \mathrm{~mm} \mathrm{Hg} \) at \( 20^{\circ} \mathrm{C} \), while pure water vapour pressure is \( 17.25 \mathrm{~mm} \mathrm{Hg} \). Solubility product \( \left(K_{s p}\right) \) of \( \mathrm{XCl}_{3} \) at \( 20^{\circ} \mathrm{C} \) is:
(a) \( 9.8 \times 10^{-2} \)
(b) \( 10^{-5} \)
(c) \( 2.56 \times 10^{-6} \)
(d) \( 7 \times 10^{-5} \)
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