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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Wet Test for Basic Radical

  • question_answer
    In qualitative analysis, in order to detect second group basic radical, \[{{H}_{2}}S\] gas is passed in the presence of dilute HCl to [KCET 2004]

    A) Increase in dissociation of \[{{H}_{2}}S\]

    B) Decrease the dissociation of salt solution

    C) Decrease the dissociation of \[{{H}_{2}}S\]

    D) Increase the dissociation of salt solution

    Correct Answer: C

    Solution :

    HCl suppresses ionisation of weakly dissociated \[{{H}_{2}}S,\] with the result only the ionic product of the sulphides of group II radicals exceed their corresponding solubility product and hence only these are precipitated.


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