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The freezing point of an aqueous solutio...

The freezing point of an aqueous solution of KCN containing 0.1 mol `kg^(-1)` was `-0.38^(@)` C. On adding 0.005 moles of `Hg(CN)_(2)` per kg of solvent, the freezing point of the solution remined as `-0.38^(@)` C. Assuming following reaction to be occured to `100%` extent and none of the `Hg(CN)_(2)` remaining.
`Hg(CN)_(2)(aq)+x(CN)^(-)toHg(CN)_(x+2)^(x-)(aq)`
calculate the value of 'x'.

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