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Addition of HgI2 to an aqueous solution ...

Addition of `HgI_2` to an aqueous solution of KI shows an increase in vapour pressure. Why?

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`Hgl_2` forms a complex with KI and therefore, the number of particles in solution decreases thereby reducing the relative lowering of vapour pressure.
`2Kl+Hgl_2 to K_2[Hal_4]`
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