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JEE Main levelSingle correct optionDifficulty 2 of 3qc031

Which set contains only cations whose sulphides do NOT dissolve in yellow ammonium sulphide?

A $Cd X^{2 +}$ , $Cu X^{2 +}$ , $As X^{3 +}$
B $Pb X^{2 +}$ , $Bi X^{3 +}$ , $Cu X^{2 +}$
C $Pb X^{2 +}$ , $Sb X^{3 +}$ , $Bi X^{3 +}$
D $Cu X^{2 +}$ , $Cd X^{2 +}$ , $Sn X^{4 +}$

Answer: B

The group IIA sulphides of

Pb

,

Bi

,

Cu

and

Cd

are insoluble in yellow ammonium sulphide.

As X_{2} S X_{3}

,

Sb X_{2} S X_{3}

and

SnS X_{2}

(group IIB) dissolve as thio-anions, so the other three sets each contain one dissolving ion.

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