Which compound is formed when copper is burnt in air?

In which process is a protective zinc coating applied on iron to prevent it from rusting?

On heating copper powder in air, a layer of copper oxide accumulates on its surface. What is the color of this layer?

Which of the following is not oxidized?

Water in case of HCl acts as a/an ___________, in case of ammonia acts as a/an ________

Nowadays yellow lamps are being used in abundance in street lights. Which of the following gas are used in these lamps?

Herbs- The decomposition of vegetables into compost is an example of which reaction?

The litmus dye is purple in color, which is removed?