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Vapour pressure of a solution containing...

Vapour pressure of a solution containing solution of a sparingly soluble salt `A_(2)B_(3)` is `31.8 mm` of `Hg` at `40^(circ)C`. IF vapour pressure of pure water is `31.9 mm` of `Hg` at `40^(circ) C`, calculate `K_(SP)` of `A_(2)B_(3)` at `40^(circ)C`.

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The correct Answer is:
`5.672 xx 10^(-6)` ;
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