$P_4 + 3NaOH + 3H_2O \to A + 3NaH_2PO_2$. Here,$A$ is:

The reaction that does not produce nitrogen is

How is ammonia manufactured industrially?

Among the oxides of nitrogen,$N_2O$,$NO$,and $NO_2$,molecules with unpaired electrons are:

Which of the following statements is true regarding the properties of $PH_3$?

Give the correct characteristic colours of the products $(P, Q, R, S)$ formed in the following reactions:
$(A)\ NO + NO_2 \xrightarrow{< 250 K} P$
$(B)\ 2 NO_2 \longleftrightarrow Q$
$(C)\ Pb(NO_3)_2 \xrightarrow{673 K} R + PbO$
$(D)\ 4 HNO_3 + P_4O_{10} \longrightarrow S + 4 HPO_3$