Give reason why :

(a) copper metal is used for making electric wires.

(b) graphite is used for making electrode in a cell.

(c) immersion rods for heating liquids are made of metallic substances.

a) Copper is used for electrical wiring because it is a very good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
b) Graphite is good conductor of electricity due to the vast electron delocalization within the carbon layers. These valence electrons are free to move, so are able to conduct electricity. Also, it is cheaper. It is also non-corrosive.

c) Immersion rods are made up of metallic substances because metals are good conductors of heat and electricity . And so they can conduct heat through them to the liquids.