The number of hydrogen atoms directly attached to the phosphorus atom in phosphorous acid is

Phosphorus reacts with chlorine gas to give a colourless liquid,which fumes in moist air to produce $HCl$ and

Sodium nitrite with hydrochloric acid gives water along with two nitrogen oxides. They are

The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is

Which of the following statements is not correct regarding the $NO_2$ molecule?

Which of the following reactions correctly represent the products formed upon heating?
$(a) \ NH_4NO_2 \xrightarrow{\Delta } N_2 + 2H_2O$
$(b) \ NH_4NO_3 \xrightarrow{\Delta } N_2O + 2H_2O$
$(c) \ Na_2CO_3 \xrightarrow{\Delta } Na_2O + CO_2$
$(d) \ NH_4Cl \xrightarrow{\Delta } NH_3 + HCl$