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H ₂ ~S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because

Options

  1. Apresence of HC1 decreases the sulphide ion concentration.
  2. Bsolubility product of group II sulphides is more than that of group IV sulphides.
  3. Cpresence of HCl increases the sulphide ion concentration.
  4. Dsulphides of group IV cations are unstable in HC 1

Correct answer

A. presence of HC1 decreases the sulphide ion concentration.

Step-by-step solution

IV ^ th group needs higher S ²⁻ ion concentration. In presence of HCl , the dissociation of H ₂ ~S decreases hence produces less amount of sulphide ions due to common ion effect, thus HCl decreases the solubility of H ₂ ~S which is sufficient to precipitate II ^ nd group radicals.

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