Identify the weakest halogen acid from the following.

The standard reduction potential values of some of the $p-$block ions are given below. Predict the one with the strongest oxidising capacity.

Aqueous solution of which of the following acids cannot be kept in a bottle of glass?

The correct order of acidity of $HClO$, $HBrO$, and $HIO$ is

Which of the following is the most active halogen?

$Cl_{2(g)} + Ba(OH)_2 \to X (aq.) + BaCl_2 + H_2O$
$X + H_2SO_4 \to Y + BaSO_4$
$Y \xrightarrow[\Delta > 365 \ K]{\Delta } Z + H_2O + O_2$
$Y$ and $Z$ are respectively