A solution of a substance 'X' is used for whitewashing.
Name the substance 'X' and write its formula.

A solution of a substance 'X' is used for whitewashing. Write the reaction of the substance 'X' named with water.

Name a substance used for adsorption of hydrogen gas.

Name one paramagnetic substance.

What are alloys? Name one important alloy and give its uses.

How is the half life of a radioactive substance related to its average life?

Using stock method write the formula of chromium oxide.