When ammonia is added to a cupric salt solution,the deep blue colour is observed; it is due to the formation of

Which of the following statements is incorrect?

Assertion : $NF_3$ is a weaker ligand than $N(CH_3)_3$.
Reason : $NF_3$ ionizes to give $F^{-}$ ions in aqueous solution.

$CrCl_3 \cdot xNH_3$ can exist as a complex. $A$ $0.1 \ m$ aqueous solution of this complex shows a depression in freezing point of $0.558^{\circ} C$. Assuming $100 \%$ ionisation of this complex and that the coordination number of $Cr$ is $6$,the complex will be: (Given $K_f = 1.86 \ K \ kg \ mol^{-1}$)

Ammonia is a Lewis base. It forms complexes with cations. Which one of the following cations does not form a complex with ammonia?

Which among the following does not form a white precipitate with $AgNO_3$ solution?