Which among the following noble gases does not form clathrates?

Which of the following oxide can act as both reducing and oxidising agent?

Xenon fluorides are reactive.

Which of the following is not formed on hydrolysis of PCl5?

Who discovered the element chlorine?

What is the most stable oxidation state of the oxygen atom?

Which of the following processes involves heating a carbonate ore to form metal oxide?

Halogens do not occur in the free state.