What product(s) is/are formed when aluminum metal is treated with concentrated nitric acid?

What happens in the purifying chamber in contact process?

Which of the following would instantly react with chlorine?

Red phosphorus is kept under water to protect it from air.

Like white phosphorus, which phosphorus also exists as P4?

How many P-H bonds does hypophosphorous acid contain?

Halogens do not occur in the free state.

Which group does the name ‘pnictogens’ refer to?