What are interhalogen compounds used as?

Which of the following is used for vulcanization purposes in the rubber industry?

Which of the following is the displays the most basic nature in water?

Which of the following is a suitable test to identify presence of chlorine atoms or ions?

Which of the following would instantly react with chlorine?

What is the general electronic configuration of the halogens?

Which is the correct statement regarding halogens?

In the contact process, SO2 is passed twice through the catalytic converted. Why?