In Nessler's reagent, the active ion is :

H g^{+}

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H g^{2 +}

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H g_{2}^{2 -}

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H g I_{4}^{2 -}

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Solution

The correct option is C $H g I_{4}^{2 -}$
Potassium tetraiodomercurate(II) is an inorganic compound consisting of potassium cations and the tetraiodomercurate (II) anion. It is mainly used as Nessler's reagent.
In Nessler's reagent, the active ion is $H g I_{4}^{- 2}$

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