Food cans are coated with tin and not with zinc because

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it,as shown in the figure below.
$(a)$ What will be the action of the gas on
$(i)$ dry litmus paper?
$(ii)$ moist litmus paper?
$(b)$ Write a balanced chemical equation for the reaction taking place.

Differentiate between metal and non-metal on the basis of their chemical properties.

Write equations for the reactions of:
$(i)$ Iron with steam
$(ii)$ Calcium and potassium with water

What are amphoteric oxides? Give two examples of amphoteric oxides.

What chemical process is used for obtaining a metal from its oxide?