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Question

The ion that cannot be precipitated by both HCl and H2S is :

A
Pb2+
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B
Cu+
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C
Ag+
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D
Sn2+
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Solution

The explanation for correct option:

Option(B) Sn+2

  • The ion that cannot be precipitated by both HCl and H2S is Sn2+.

  • Sn2+ cannot be precipitated by HCl, because it forms soluble stannous chloride.

Sn+2+2HCl(aq)SnCl2(aq)+2H+

  • but is precipitated by H2S as a chocolate-colored precipitate of SnS, soluble in yellow ammonium sulphide.

Sn+2+H2S(aq)SnS(s)+2H+

  • while Pb+2,Cu+2,Ag+ can be precipitated by HCl as well as as their insoluble chlorides and sulfides respectively.

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