Name the gas that can readily decolourise acidified $KMnO_4$ solution.

The element which is the most abundant in the earth's crust is

Which among the following $P$-block elements forms a colourless and odourless hydride?

Identify the increasing order of acidity for the following diprotic acids in aqueous solutions: $H_2S$, $H_2Se$, and $H_2Te$.

Which one of the following is not true at room temperature and pressure?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{Te}F_6 + H_2O \longrightarrow H_6TeO_6 + HF$