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MolSynapse / Question bank / Qualitative Analysis: Cations / Group I and group II cations (Pb, Cu, Bi, Cd, As, Sb, Sn)

JEE Main levelOne or more correct optionsDifficulty 2 of 3qc174

Which of the following sulphides are insoluble in yellow ammonium sulphide (belong to group IIA)?

A $CuS$
B $CdS$
C $As X_{2} S X_{3}$
D $SnS X_{2}$

Answer: A, B

Basic sulphides CuS and CdS do not form thioanions and remain as residue.

As X_{2} S X_{3}

and

SnS X_{2}

are acidic and dissolve as thioarsenite/thiostannate.

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