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During chromyl chloride test change in oxidiation state of chromium takes place

${NO}_{3}^{-}$ gives brown ring test in presence of dil. $H_{2} {SO}_{4}$

Alkaline solution of $K_{2} {HgI}_{4}$ is known as Nessler's reagent

On passing $H_{2} S$ gas into aqueous solution of ${SO}_{2}$ gas clear solution is produced

answer is D.

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Detailed Solution

Alkaline solution of $K_{2} {HgI}_{4}$ is known as Nessler's reagent.

Nessler's reagent is the name given to an alkaline solution of $K_{2} {HgI}_{4}$ in honour of Julius Neßler (Nessler). In the addition of ammonia, this light solution darkens to a darker yellow colour. When concentrations are greater, a brown precipitate might occur.

Hence the correct option is D.

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