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In qualitative analysis, in order to detect second group basic radical, H ₂ ~S gas is passed in the presence of dilute HCl to

Options

  1. Adecrease the dissociation of H ₂ ~S
  2. Bincrease the dissociation of salt solution
  3. Cincrease the dissociation of H ₂ ~S
  4. Ddecrease the dissociation of salt solution

Correct answer

A. decrease the dissociation of H ₂ ~S

Step-by-step solution

On passing H ₂ ~S gas in presence of dil. HCl for qualitative analysis of second group due to common ion effect, lower concentration of sulphide ions is obtained. It is sufficient for the precipitation of second group cations in forms of their sulphides and hence their dissociation decreases.

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