Question

Assertion : - 'Diamonds are forever' is generally quoted for diamond as rate of conversion of diamond to graphite at room condition is nearly zero.

Reason : - Thermodynamical data indicates that diamond shall convert to graphite. (Spontaneous process) ($\Delta$G < 0)

• A. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
• B. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
• C. Assertion is true but Reason is false.
• D. Assertion is false but Reason is true.

Answer 1

Answer: (B)

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

Answer 2

The assertion is true because the conversion rate of diamond to graphite is extremely slow at room temperature due to a high activation energy barrier. The reason is also true because thermodynamically, graphite is more stable than diamond (ΔG < 0). However, the reason doesn't explain the assertion; the slow conversion rate is due to kinetics (activation energy), not thermodynamics (Gibbs free energy).