Which of the following compounds has reducing character?

Assertion : Dinegative anion of oxygen $(O^{2-})$ is quite common but dinegative anion of sulphur $(S^{2-})$ is less common.
Reason : Covalency of oxygen is two.

Ozone $(O_3)$ belongs to which group of the periodic table?

Statement $(A)$ Sulphur vapour is paramagnetic. Statement $(B)$ Reaction of dil. $HCl$ with finely divided iron forms $FeCl_3$ and $H_2$ gas. The correct answer is

Identify the incorrect statement regarding ozone $(O_3)$.

The thermal stability of the hydrides of group-$16$ elements follows the order: