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KCET2015ChemistryChemical Bonding and Molecular Structure

In presence of ( HCl , H ₂ ~S ) results the precipitation of Group-2 elements but not Gp-4 elements during qualitative analysis. It is due to

Options

  1. Ahigher concentration of ( S² )
  2. Bhigher concentration of ( H⁺ )
  3. Clower concentration of ( S²⁻ )
  4. Dlower concentration of ( H⁺ )

Correct answer

C. lower concentration of ( S²⁻ )

Step-by-step solution

Dissociation of ( H ₂ ~S ) is suppressed in presence of ( HCl ) due to common ion effect. This decreases the ( S ²⁻ ) ion concentration and hence, only Group II radicals having low solubility product are precipitated.

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