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 (A) X = NH4Cl and Y = KOH (B)

Question

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

(A) X = NH4Cl and Y = KOH
(B) X = NH3 and Y = HgO
(C) X = HCl and Y = NH4Cl
(D) X = NH3 and Y = K2HgI4 + KOH

Prashant Kotian · Accepted Answer

Correct answer: D. NH4+ + NaOH  H2O + NH3 2[HgI4]2– + NH3 + 3OH–  HgO.Hg NH2 Brown ppt. I + 7I– + 2H2O

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