What is the color of copper carbonate salt?

An electrolytic cell consists of:
$(i)$ Positively charged cathode
$(ii)$ Negatively charged anode
$(iii)$ Positively charged anode
$(iv)$ Negatively charged cathode

Which metal is purified by the method of liquation?

Which of the following methods is $NOT$ a method for the refining of metals?

Give a reason why electrical wires are coated with plastic.

From amongst the metals sodium,calcium,aluminium,copper and magnesium,name the metal:
$(i)$ which reacts with water only on boiling,and
$(ii)$ another which does not react even with steam.