Which of the following has $S-S$ bond?

Point out in which of the following properties oxygen differs from the rest of the members of its family (Group-$16$)

Which of the following statements is correct for oleum?

Bleaching action of $SO_2$ is due to its

Below are two statements. One is labeled as Assertion $(A)$ and the other as Reason $(R):$
Assertion $(A):$ $H_2Te$ is more acidic than $H_2S$.
Reason $(R):$ The bond dissociation enthalpy of $H_2Te$ is less than that of $H_2S$.
In the context of the above statements,choose the correct answer from the following options:

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