Which of the following is a colourless gas that exhibits both oxidising and reducing properties?

Which of the following ions possesses an $S-O-S$ bond?

What is formed when sulfur dioxide reacts with bromine water?

Assertion : Reaction of $SO_2$ and $H_2S$ in the presence of $Fe_2O_3$ catalyst gives elemental sulphur.
Reason : $SO_2$ is a reducing agent.

Peroxodisulphuric acid $(H_2S_2O_8)$ contains which of the following bonds?

Given below are two statements $:$
Statement $I : H_2Se$ is more acidic than $H_2Te$.
Statement $II : H_2Se$ has higher bond enthalpy for dissociation than $H_2Te$.
In the light of the above statements,choose the correct answer from the options given below.