Nessler's reagent is an alklaine solution which contains _______.

K_{2} {H g I}_{4}

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{K H g I}_{2}

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K_{2} {H g I}_{2}

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{K H g I}_{4}

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Solution

The correct option is A $K_{2} {H g I}_{4}$
An alkaline solution of $K_{2} {H g I}_{4}$ is called Nessler's reagent. This pale solution becomes deeper yellow in the presence of ammonia.

Potassium tetraiodomercurate(II) is an inorganic compound consisting of potassium cations and the tetraiodomercurate(II) anion. It is mainly used as Nessler's reagent.

The chemical reaction is given as:
${H g C l}_{2}$ (aq) + 4KI (aq) → $K_{2} {[H g I}_{4}]$ (aq) + 2 KCl (aq)

The correct answer is option (d).

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