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Calomel (Hg2Cl2) on reaction with ammonium hydroxide gives

1. HgO
2. Hg2O
3. NH2−Hg−Hg−Cl
4. HgNH2Cl

Correct answer: HgNH2Cl

Solution

The reaction of calomel with ammonium hydroxide leads to the formation of mercuric amidochloride (HgNH2Cl) as it involves the substitution of chloride ions by the amine group from ammonium hydroxide.

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