Litharge is chemically

Pentavalency in phosphorus is more stable when compared to that of nitrogen,even though they belong to the same group. This is due to:

Nitrogen $(I)$ oxide is produced by

Which one of the following group-$15$ hydrides is the strongest reducing agent?

Discuss the reactivity of group-$15$ elements with metals.

Identify the reactions in which $N_2$ is liberated.
$a. \ (NH_4)_2SO_4 + NaOH \longrightarrow$
$b. \ NH_3 + Cl_2 \longrightarrow$ (excess $Cl_2$ is not specified, but $N_2$ is formed when $NH_3$ is in excess)
$c. \ (NH_4)_2Cr_2O_7 \xrightarrow{\Delta}$
$d. \ NH_4NO_3 \xrightarrow{\Delta}$
$e. \ NH_4Cl_{(aq)} + NaNO_{2_{(aq)}} \longrightarrow$