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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