You are given a hammer, a battery, a bulb, wires and switch.

(a) How could you use them to distinguish between samples of metals and non-metals?

(b) Asses the usefulness of these tests in distinguishing between metals and non-metals?

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

In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?

Pratyush took sulphur powder on spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown 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.