Which of the following pentahalides is $NOT$ formed?

Which of the following oxides of nitrogen is not a common pollutant in the atmosphere?

The statement true for $N_3^-$ is

Which of the following is the correct order of bond angles in the given hydrides?

On heating lead $(II)$ nitrate gives a brown gas $'A'$. The gas $'A'$ on cooling changes to a colourless solid $'B'$. Solid $'B'$ on heating with $NO$ changes to a blue solid $'C'$. Identify $'A'$,$'B'$ and $'C'$,write the reactions involved,and draw the structures of $'B'$ and $'C'$.

Dilute nitric acid on reaction with silver liberates