Which of the following oxides is paramagnetic?

Which of the following statements is correct for $PH_3$?

Illustrate how copper metal can give different products on reaction with $HNO_3$.

Which of the following statements is $NOT$ true for both white and red phosphorus?

$A$ pungent smelling gas $A$ gives dense white fumes with conc. $HCl$. When $A$ reacts with an alkaline solution of a colourless reagent $B$,a reddish-brown precipitate $C$ is formed. The compounds $A, B, C$ respectively are:

The temperature required for electrolysis is maximum for which of the following hydrides?