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To aqueous solution of `Nal`, increasing amounts of solid `Hgl_(2)`, is added. The vapor pressure of the solution
A. decreases to a constant value
B. increases to a constant value
C. increases first and then decreases
D. remains constant because `Hgl_(2)` is sparingly soluble in water.

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Correct Answer - 2
`2Na^(+)(aq)+2I^(-)(aq)+HgI_(2)(g)rarrNa^(+)(aq)+HgI_(4)^(2-)(aq)`
The number of mole particle decrease from `4(2Na^(+)+2I^(-))` to to `3(2Na^(+)+HgI_(4)^(2-))`. Hence, the colligative property will decrease ot, the vapour pressure will increase to a constant value until NaI is completely consumed.

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