The action of concentrated nitric acid $(HNO_3)$ on metallic tin $(Sn)$ produces:

The boiling points of the following hydrides follow the order of:

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

Heating $(NH_4)_2Cr_2O_7$ releases a gas. Which of the following also produces the same gas?

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

Explain the molecular structure and properties of phosphorus pentachloride $(PCl_5)$.