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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2004

  • 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:    

    A)  increase the 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 :

    In qualitative analysis, in order to detect lI nd group radicals, \[{{H}_{2}}S\] gas is passed in the presence of dilute \[HCl\] to decrease the dissociation of \[{{H}_{2}}S\] by common-ion effect so that less \[{{S}^{2-}}\] - ions are obtained and only Il nd group radical could precipitate.


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