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

  • question_answer
    In fifth group, \[{{\left( N{{H}_{4}} \right)}_{2}}C{{O}_{3}}\] is added to precipitate out the carbonates. We do not add \[N{{a}_{2}}C{{O}_{3}}\] because [AIIMS 1982]

    A) \[CaC{{O}_{3}}\] is soluble in \[N{{a}_{2}}C{{O}_{3}}\]

    B) \[N{{a}_{2}}C{{O}_{3}}\] increases the solubility of fifth group carbonates

    C) \[MgC{{O}_{3}}\] will be precipitated out in fifth group

    D) None of these

    Correct Answer: C

    Solution :

    As \[N{{a}_{2}}C{{O}_{3}}\] is a strong electrolyte it will cause the precipitation of MgCO3. So (NH4)2CO3 is used as it?s a weaker electrolyte than \[N{{a}_{2}}C{{O}_{3}}.\]


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