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KVPY Sample Paper KVPY Stream-SX Model Paper-6

  • question_answer
    On adding ammonium hydroxide solution to\[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}(aq)\]

    A) a precipitate is formed which does not dissolve in excess of ammonium hydroxide

    B) A precipitate is formed which dissolves in excess of ammonia solution

    C) No precipitate is formed

    D) None of these

    Correct Answer: A

    Solution :

    \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+6N{{H}_{4}}OH\xrightarrow{{}}\]\[2Al{{(OH)}_{3}}+3{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\]
    \[Al{{(OH)}_{3}}+NaOH\to N{{a}^{+}}{{[Al{{(OH)}_{4}}]}^{-}}\]
    Soluble complex it is insoluble in \[N{{H}_{4}}OH\]


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