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The Aldol Addition

passing H2S g...

Question

passing H2S gs into a mixture of Fe3+, Ni2+, Zn2+, Pb2+, Cu2+ ions in an acidified aqueous soluton precipitates
a. Pb2+,Cu2+
b. Fe3+, Ni2+
c. Ni2+, Cu2+
d. Zn2+, Pb2+

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Solution

Group (II) cations are precipitated as sulphides when H₂S is passed through acidified aqueous solutions of these ions.
Thus, Pb²⁺ and Cu²⁺ will be precipitated.

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