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  3. Uttarakhand PMT

Uttarakhand PMT Uttarakhand PMT Solved Paper-2007

  • question_answer
    The solution of Na in dry ether not only contains\[Na_{slov.}^{+}\]and\[e_{slov.}^{-}\]but also contains \[Na_{slov.}^{-}\]formed by the following disproportionatipn reaction. \[2Na(s)Na_{solv.}^{+}+Na_{solv.}^{-}\] The large sodide ion can be stabilized by making its

    A)  cryptand-222

    B)  clatherate

    C)  complex with saticylaldehyde

    D)  complex with acetylacetone

    Correct Answer: A

    Solution :

     With cryptand-222, Na forms an unusual compound of the formula, [Na (cryptand-222)] \[N{{a}^{-}}\]. The large cryp ligand completely shields the \[N{{a}^{+}}\]. ion and prevents it combining with\[N{{a}^{-}}\].


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