What is the secondary valence of $Co^{3+}$ ion according to Werner's theory in $[Co(NH_3)_4 Cl_2]^+$?

Explain the following term with an example: Tetradentate ligands.

When $AgNO_3$ is added to an aqueous solution of a platinum complex,$1/4$ of the total chlorine content is precipitated. Determine the formula of the platinum complex from the given options.

The number of chloride ions produced in an aqueous solution of tetraamminedichloroplatinum $(IV)$ chloride is ...........

What are coordination compounds?

Which of the following statements is incorrect?