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In Nessler's reagent for the detection o...

In Nessler's reagent for the detection of ammonia the active species is

A

`Hg_(2)Cl_(2)`

B

`Hg^(+2)`

C

`Hg_(2)I_(2)`

D

`HgI_(4)^(2-)`

Text Solution

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The correct Answer is:
D
Nessler’s reagent gives red precipitate with `NH_(4)^(+)`
`NH_(4)Cl + 2K_(2)[HgI_(4)] + 4KOH to NH_(2) - Hg - O-Hg - I + 7KI + KCl + 3H_(2)O`
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