Ozone,when reacts with potassium iodide solution,liberates a certain product which turns starch paper blue. The liberated substance is......

At what temperature does dioxygen gas liquefy and at what temperature does it freeze?

State the electronic configurations of group-$16$ elements.

When $SO_2$ is passed through a solution of $H_2S$ in water :-

Sulphur trioxide can be obtained by which of the following reactions?

Given below are two statements:
Statement $I$: Oxygen being the first member of group $16$ exhibits only $-2$ oxidation state.
Statement $II$: Down the group $16$ stability of $+4$ oxidation state decreases and $+6$ oxidation state increases.
In the light of the above statements,choose the most appropriate answer from the options given below: