The solubility of silver bromide in hypo solution is due to the formation of

Select the correct $M-C$ bond order.

An aqueous solution of $FeSO_4$ gives tests for both $Fe^{2+}$ and $SO_4^{2-}$ ions,but after the addition of an excess of $KCN$,the solution ceases to give a test for $Fe^{2+}$. This is due to the formation of:

Which of the following will $NOT$ give the characteristic test for $Fe^{2+}$ or $Fe^{3+}$ ions?

Copper sulphate solution reacts with $KCN$ to give

Which of the following ligands does not show synergic bonding with a central metal atom?