During the electrolytic refining of zinc,it gets :

Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of:

Which of the following properties of $H_2$ (dihydrogen) gas is $NOT$ correct?

What happens when:
$(i)$ $A$ piece of calcium is dropped in water.
$(ii)$ Sodium is kept exposed in air.
$(iii)$ Iron nail is dipped in copper sulphate solution.
$(iv)$ Potassium is dropped in cold water.
$(v)$ Carbon dioxide is compressed in water at high pressure.
Give chemical equations involved in all the above reactions and balance them.

What is the ratio of dihydrogen gas to dinitrogen gas used in the production of ammonia gas by Haber's process?

Which method/process is used to obtain aluminium from pure alumina?