Consider the following statements (iii) Diamond is a bad conductor and graphite is a good conductor.

Question

Consider the following statements:

(i) Diamond is hard and graphite is soft.

(ii) Diamond is soft and graphite is hard.

(iii) Diamond is a bad conductor and graphite is a good conductor.

(iv) Diamond is a good conductor and graphite is a bad conductor.

Which of the statements given above is/are correct?

1. A. (i) and (iii) (Correct answer)
2. B. (i) only
3. C. (ii) and (iii)
4. D. (i) and (iv)

Correct Answer

Option A — (i) and (iii)

Detailed Solution & Explanation

The correct answer is (i) and (iii).

Key Points

• Statements (i) and (iii) are correct.
• Diamond is the hardest natural substance (10 on Mohs scale) while graphite is soft (1–2 on Mohs scale).
• Diamond is a bad conductor of electricity (all 4 electrons are bonded), while graphite is a good conductor (delocalized electrons).
• Both are allotropes of carbon with different crystal structures.