Periodic Classification and Periodic Properties 2 Question 33

33.

Statement I The first ionisation energy of Be is greater than that of B.

Statement II 2p-orbital is lower in energy than 2s.

(2000, (S), 1M)

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Answer:

Correct Answer: 33. (c)

Solution:

  1. Statement I is true Be has higher first ionisation energy than B which is against periodic trend.

Statement II is false 2s-orbital is lower in energy than 2p, Aufbau’s principle.

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