Which of the following molecules exhibits the lowest thermal stability?

Justify the placement of $O$,$S$,$Se$,$Te$,and $Po$ in the same group of the periodic table in terms of electronic configuration,oxidation state,and hydride formation.

When sulphur is boiled with $Na_2SO_3$ solution,the compound formed is

The element which does not belong to group $15$ is

Which of the following statements is incorrect for sulfur?

The formula of ozone is $O_3$,it is