Q.

Metals are good conductors of electricity because -

A. they contain free electrons
B. the atoms are lightly packed
C. they have high melting point
D. All of the above
Answer» A. they contain free electrons
Explanation: Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
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