$PH_3$ is a non-inflammable gas but becomes inflammable owing to the presence of:

Which of the following substances does not produce ammonia upon heating?

The mixed anhydride of nitrogen is

In the ring test of $NO_{3}^{-}$ ion,$Fe^{2+}$ ion reduces nitrate ion to nitric oxide,which combines with $Fe^{2+}_{(aq)}$ ion to form a brown complex. Write the reactions involved in the formation of the brown ring.

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 $'C'$.

In the Ostwald process for the manufacture of $HNO_3$,which of the following is used as a catalyst?