Question

Statement I The first ionisation energy of Be is greater than that of B.
Statement II 2p-orbital is lower in energy than 2s (J2000, (s), 1M)

• A. Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
• B. Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
• C. Statement I is true; Statement II is false.
• D. Statement I is false; Statement II is true.

Answer 1

The correct option is C Statement I is true; Statement II is false.

Statement I is true Be has higher first ionisation energy than B which is against peiodic trend.
Statement II is false 2s-orbital is lower in energy than 2p, Aufbau's principle.