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When a salt is treated with sodium hydroxide solution it gives gas X. On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are

1. X = NH 3 and Y = K 2 HgI 4 + KOH
2. X = NH 3 and Y = HgO
3. X = HCl and Y = NH 4 Cl
4. X = NH 4 Cl and Y = KOH

Correct answer: X = NH 3 and Y = K 2 HgI 4 + KOH

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