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A solution of $H g^{2 +}$ ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate, then the coordination number of mercury in the deep blue colored compound is :

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Solution

A solution of $H g^{2 +}$ ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. Then the coordination number of mercury in the deep blue colored compound is 4.
$H g^{2 +} + 2 C o (S C N)_{2} \to C o [H g (S C N)_{4}] ↓ deep blue crystalline precipitate + C o^{2 +}$

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