Which ligand is used in the estimation of the hardness of water?

What metal is present in Wilkinson's catalyst,which is used as a homogeneous catalyst for the hydrogenation of alkenes?

$PCl_5$ reacts with finely divided silver on heating and a white silver salt is obtained,which dissolves on adding excess aqueous $NH_3$ solution. Write the reactions involved to explain what happens.

The colour of light absorbed by an aqueous solution of $CuSO_4$ is:

Which among the following is used in the treatment of cancer?

State the importance of coordination compounds in electroplating.