The colour of $KMnO_4$ is due to

Which ion in excess $NaOH$ does not form a soluble complex?

$X$ is the number of electrons in $t_{2g}$ orbitals of the most stable complex ion among $[Fe(NH_3)_6]^{3+}$,$[Fe(Cl)_6]^{3-}$,$[Fe(C_2O_4)_3]^{3-}$ and $[Fe(H_2O)_6]^{3+}$. The nature of the oxide of vanadium of the type $V_2O_X$ is:

The $CN^-$ ion exhibits which of the following properties towards metal components: $(a)$ Reducing agent,$(b)$ Oxidizing agent,$(c)$ Complexing agent?

Which of the following complexes does not give a precipitate with $AgNO_3$ solution?

Which of the following is non-conducting?