Q.

The ion that cannot be precipitated by both by HCI and H2S is

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a

Pb2+

b

Cu⊕

c

Ag⊕

d

Sn2+

answer is B.

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Detailed Solution

Cu⊕ disproportionates in the aqueous solution to a very large extent2Cu⊕⇌Cu2++CuK=Cu2+Cu⊕2=1.6×106Thus, the concentration of Cu⊕ ion is very small, and hence it cannot be precipitated.
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The ion that cannot be precipitated by both by HCI and H2S is