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Nessler's reagent is:

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K_{2} {HgI}_{4}

K_{2} {HgI}_{4} + KOH

K_{2} {HgI}_{2} + KOH

K_{2} {HgI}_{4} + KI

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detailed solution

Correct option is B

A solution known as Nessler reagent $(K_{2} {Hlg}_{4})$ is created by mixing sodium hydroxide, potassium iodide, mercuric chloride, and/or mercury iodide.

${NH}_{4}^{+} \overset{H_{2} {PtCl}_{6}}{⟶} {({NH}_{4})}_{2}$ $({PtCl}_{6}) ↓$ (Yellow ppt.)

$↓$

$\frac{{Na}_{3} [Co {({NO}_{2})}_{6}]}{}$ ${({NH}_{4})}_{3} [Co {({NO}_{2})}_{6}] ↓$ $(Yellow ppt .)$

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