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NDA 2022 GAT · General Knowledge · Carbon and Organic Chemistry · medium

Diamond is a good conductor of electricity. 2. Graphite is used as a dry lubricant.

Single correct option

Which of the statements given below is/are correct?
1. Diamond is a good conductor of electricity.
2. Graphite is used as a dry lubricant.
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (B) 2 only

Every carbon in diamond forms four strong covalent bonds, leaving no free electrons, so it is an insulator; statement 1 is wrong. Graphite has layers that slide over each other, so it works as a dry lubricant; statement 2 is correct.
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Original question written in the NDA 2022 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake