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$C u^{2 +}$ and $C d^{2 +}$ may be distinguished and separated from a mixture of their solutions by using

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KCN and $H_{2} S$

$H C l$ and $H_{2} S$

$K_{3} [F e {(C N)}_{6}]$ and $H_{2} S$

Concentrated $N H_{3}$ and $H_{2} S$

answer is A.

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$H_{2} S$ passed only CdS PPt occurs.

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