Bleaching action of $SO_2$ is due to

Which of the following is used to absorb sulphur dioxide?

In the manufacture of sulphuric acid by the contact process,the Tyndall box is used to

The most stable form of sulphur allotrope is

Identify the correct statements from the following:
$i$. Sulphuric acid is manufactured by contact process.
$ii$. $SO_3$ dissolves in $H_2SO_4$ to form pyrosulphuric acid $(H_2S_2O_7)$.
$iii$. $H_2SO_4$ is used in the manufacture of fertilisers such as ammonium sulphate and super phosphate.
$iv$. In the reaction,$S + 2H_2SO_4 (\text{conc.}) \longrightarrow 3SO_2 + 2H_2O$,$H_2SO_4$ is oxidised to $SO_2$.

Which of the following is the wrong statement?