What is formed when $H_2S$ reacts with $O_2$?

How is the presence of $SO_{2}$ detected?

State the melting point,boiling point,and specific gravity of $H_2SO_4$.

Which of the following statements is correct regarding the oxygen family (Group $16$)?
$(i)$ The stability of $+6$ oxidation state decreases down the group and the stability of $+4$ oxidation state increases down the group.
$(ii)$ The stability of $+6$ oxidation state increases down the group and the stability of $+4$ oxidation state decreases down the group.
$(iii)$ Bonding in $+4$ and $+6$ oxidation states is primarily covalent.

$V_2O_5$ is useful as a catalyst in:

Which of the following elements exhibits the highest property of catenation?