Give reasons : Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Why is sodium kept immersed in kerosene oil ?

State two ways to prevent the rusting of iron.

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

Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Give an example of a metal which

$(i)$ is a liquid at room temperature.

$(ii)$ can be easily cut with a knife.

$(iii)$ is the best conductor of heat.

$(iv)$ is a poor conduct of heat.