JEE Main & Advanced Sample Paper JEE Main Sample Paper-45

  • question_answer
    Direction: The dissociation of complex may be expressed as \[{{[M{{L}_{x}}]}^{4+}}\,+xL\] and equilibrium constant of this is known as instability constant which is a measure of stability. The stability of complex depends on EAN of central atom, charge on metalion, basic nature of ligand and chelation.
    Which complex is most stable where \[{{K}_{d}}\] is un stability constant?

    A)  \[{{[Cu\,{{(CN)}_{2}}]}^{-}}\,{{K}_{d}}=1\times {{10}^{-16}}\]

    B)  \[{{[Fe{{(CN)}_{6}}]}^{4-}}{{K}_{d}}=1\times {{10}^{-37}}\]

    C)  \[{{[Fe{{(CN)}_{6}}]}^{3-}}{{K}_{d}}=1\times {{10}^{-44}}\]

    D)  \[[Ag{{(CN)}_{2}}^{-}{{K}_{d}}=1\times {{10}^{-20}}\]

    Correct Answer: C

    Solution :

     Stability constant, \[{{K}_{s}}=\frac{1}{{{K}_{d}}}=1\times {{10}^{44}}\] Thus, \[{{[Fe\,{{(CN)}_{6}}]}^{3-}}\] is the most stable among the given.

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