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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3qc161

Which of the following sulphides dissolve in yellow ammonium sulphide (or ammonium polysulphide) forming thio-anions?

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

Answer: A, B, D

Group IIB sulphides (

As X_{2} S X_{3}

,

Sb X_{2} S X_{3}

,

SnS X_{2}

) give thioarsenate, thioantimonate and thiostannate.

SnS

also dissolves in yellow (polysulphide) reagent because the polysulphide oxidises

Sn (II)

to

Sn (IV)

, giving

SnS X_{3} X^{2 -}

.

CdS

belongs to group IIA and does not dissolve.

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