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  4. When calomel reacts with NH4OH, we get

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Q. When calomel reacts with NH4OH, we get

AIPMTAIPMT 1996The d-and f-Block Elements

Solution:

When calomel reacts with $NH _{4} OH$, it turns black due to the formation of a mixture of mercury and ammonium basic mercury (II) chloride.
$\underset{\text{(calomel)}}{Hg _{2} Cl _{2}}+2 NH _{4} OH \rightarrow NH _{4} Cl +2 H _{2} O + Hg + HgNH _{2} Cl$