Question

Which of the following metals is a good conductor of electricity and conducts electricity twice as much as the other elements?

(a) Fe

(b) Cu

(c) Hg

(d) Al

This question was addressed to me during a job interview.

The question is from Uses of Aluminium, Copper, Zinc and Iron in section General Principles and Processes of Isolation of Elements of Chemistry – Class 12

Answer 1

Correct option is (d) Al

For explanation I would say: Aluminium is light, cheapmetal and good conductor electricity and resists corrosion. It conducts electricity twice as that of copper. It is used for making transmission cables and for winding the moving coil of dynamos or motor.