An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be

Food cans are coated with tin and not with zinc because

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

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

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 figure below.

$(a)$ What will be the action of gas on

$(i)$ dry litmus paper ?

$(ii)$ moist litmus paper ?

$(b)$ Write a balanced chemical equation for the reaction taking place.

What are alloys ?