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KVPY Sample Paper KVPY Stream-SX Model Paper-27

  • question_answer
    When the complex  \[{{K}_{6}}\,[{{(CN)}_{5}}Co-O-O-Co\,{{(CN)}_{5}}].\] is oxidised by bromine into \[{{K}_{5}}\,[{{(CN)}_{5}}Co-O-O-Co\,{{(CN)}_{5}}].\] Then which of the following statements will be true about this change:

    A) Co (II) is oxidised in Co (II)

    B) The \[O-O\] bond length will increase

    C) The \[O-O\] bond length will decrease

    D) 'A' & 'B' both are correct

    Correct Answer: C

    Solution :

    In the first complex ligand is \[{{O}_{2}}^{2-}\] which is oxidised into \[{{O}_{2}}^{1-}.\] hence \[O-O\] bond length decreases.


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