p-Block Elements Questions

The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is:

The correct order of the thermal stability of hydrogen halides ($\text{H}-\text{X}$) is:

Heating an aqueous solution of aluminium chloride to dryness will give:

In silicon dioxide:

Regular use of which of the following fertilizers increases the acidity of soil?

The stability of dihalides of $\text{Si, Ge, Sn}$ and $\text{Pb}$ increases steadily in the sequence:

Which one of the following statements regarding helium is incorrect?

Aluminium chloride exists as a dimer, ${\text{Al}}_2{\text{Cl}}_6$, in solid state as well as in solutions of non-polar solvents such as benzene. When dissolved in water, it gives:

The soldiers of Napoleon's army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to:

Which one of the following reactions of Xenon compounds is not feasible?