Phosphine is prepared by the reaction of $P_4$ with which of the following?

Which statement is wrong for $NO$?

$HNO_3 + P_4O_{10} \to 4HPO_3 + X$. $X$ is

Which one of the following statements is correct with respect to basic character?

$A$ tetra-atomic molecule $(A)$ on reaction with nitrogen $(I)$ oxide,produces two substances $(B)$ and $(C).$ $(B)$ is a dehydrating agent in its monomeric form while substance $(C)$ is a diatomic gas which shows almost inert behaviour. The substances $(A)$,$(B)$,and $(C)$ respectively will be

The main products formed when copper metal is reacted with concentrated $HNO_3$ are