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

  • question_answer
    The presence of \[N{{H}_{4}}Cl\] in the test solution while precipitating group III-A hydroxides (in qualitative inorganic analysis) helps in

    A) Lowering \[\left[ O{{H}^{-}} \right]\]

    B) Lowering \[\left[ N{{H}_{4}}OH \right]\]

    C) Increasing \[\left[ O{{H}^{-}} \right]\]

    D) Increasing \[\left[ N{{H}_{4}}OH \right]\]

    Correct Answer: A

    Solution :

    \[N{{H}_{4}}OH~NH_{4}^{+}+O{{H}^{-}}\] \[N{{H}_{4}}Cl\to NH_{4}^{+}+C{{l}^{-}}\] \[N{{H}_{4}}Cl\]Decreases the dissociation of \[N{{H}_{4}}OH\]by common ion effect


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