You have a solution of an octahedral coordination complex with a metal you do no

Question

You have a solution of an octahedral coordination complex with a metal you do not know, [M(H2O)6]2+, which has an orange color. To make other colors a chemist has synthesized two other complexes with the same metal, [MCl6]4- and [M(en)3]2+. She was partly successful and one of the complexes is a purple solid and forms a purple solution.

a) Which complex do you think is more likely to have the purple color, [MCl6]4- or [M(en)3]2+? Explain your answer.

b) She was only partly successful in that the other new complex is a white solid. Explain why the other complex is white.

Explanation / Answer

a) i am expecting [MCl6]4- is having purple colour

because here Cl is weak ligand so electrons present in Metal will not pair up there will be a possibility of having unpaired electrons which are responsible for colour. but en is strong field ligand electrons present in metal may gets pair up so no colour.

b) as i given above due to the strong field ligand (en) electrons pair up in the metal atom so there will not be any unpaired eklectrons so it can not show any colour.

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