Question

Statement (S): Both graphite and copper are good conductors of electricity yet only copper is used to make electric wires.

Reason (R): Copper is cheaper than graphite.

• A. S is true but R is false.​
• B. R is true but S is false.​
• C. Both S and R are true,
  R is the correct explanation for S.
• D. Both S and R are true,
  R is not the correct explanation for S.

Answer 1

The correct option is D Both S and R are true,

R is not the correct explanation for S.
Properties of metals​:

• Electrical conductor - Allows the passage of electric current through them​.
• Ductility - The ability of materials to be drawn into wires.

Graphite and copper, both are good conductors of electricity, hence both are electrical conductors​

But if we talk about ductility, copper is ductile, but graphite is not. Hence graphite cannot be drawn into thin electrical wires.

On the other hand, copper is comparatively cheaper than graphite. But this fact does not explain the given statement.

Therefore, the statement is true, but the reason is not the correct explanation of the statement.​