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JEE Main & Advanced Chemistry The s-Block Elements / s-ब्लॉक के तत्व Question Bank Self Evaluation Test - The s-Block Elements

  • question_answer
    If \[NaOH\]is added to an aqueous solution of \[Z{{n}^{2+}}\] ions, a white precipitate appears and on adding excess \[NaOH,\]the precipitate dissolves. In this solution zinc exists in the:

    A) both in cafionic and anionic parts

    B) there is no zinc left in the solution

    C) cationic part

    D) anionic part.

    Correct Answer: D

    Solution :

    [d] \[Z{{n}^{2+}}+2NaOH\xrightarrow{{}}\] \[Zn{{(OH)}_{2}}+2N{{a}^{+}}\] \[Zn{{(OH)}_{2}}+2NaOH\xrightarrow{{}}\] \[N{{a}_{2}}Zn{{O}_{2}}+2{{H}_{2}}O\] \[N{{a}_{2}}Zn{{O}_{2}}\xrightarrow{{}}2N{{a}^{+}}+{{(Zn{{O}_{2}})}^{2-}}\]


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