JEE Main & Advanced Sample Paper JEE Main Sample Paper-38

  • question_answer 25) When pink \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2\oplus }}\] is dehydrated the colour changes to blue. The correct explanation for the change is :

    A)  The octahedral complex becomes square planar.

    B)  A tetrahedral complex is formed.

    C)  Distorted octahedral structure is obtained.

    D)  Dehydration results in the formation of polymeric species.

    Correct Answer: B

    Solution :

     Hydrated \[CoC{{l}_{2}}.6{{H}_{2}}O\]. is pink coloured and contains octahedral \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\] ions. If this is partially dehydrated by heating, then blue coloured tetrahedral ions \[{{[Co{{({{H}_{2}}O)}_{4}}]}^{2+}}\]are formed.

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