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Question
Solubility product of a sulphide MS is 3 × 1025 and that of another sulphide 
NS is 4 × 1040. In ammonia solution 
Options:
A .  Only NS gets precipitated
B .  Only MS gets precipitated
C .  No sulphide precipitates
D .  Both sulphides precipitate
E .  None of the options are correct.
Answer: Option D
:
D
The concentration of S2ions in group II is lowered by maintaining acidic
medium in the presence of NH4Cl. The ionization of H2Sis supressed due
tocommon ion effect. So the ionic product is less than solubility product.

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