Which of the following oxides of nitrogen is paramagnetic?

Ammonia can be dried by

On heating,compound $(A)$ gives a gas $(B)$ which is a constituent of air. This gas,when treated with $H_{2}$ in the presence of a catalyst,gives another gas $(C)$ which is basic in nature. $(A)$ should not be:

Which of the following is one of the products obtained when calcined phosphate rock is reduced with coke and sand in an electric furnace at $1773 \ K$?

What are the compounds formed when white phosphorus is dissolved in boiling $NaOH$ solution in an inert atmosphere?

When $NH_3$ is passed over heated $CuO$,what is it oxidized to?