Atomic Structure - Result Question 72

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

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

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Passage Based Questions

The hydrogen-like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion undergoes transition to a state S2. The state S2 has one radial node and its energy is equal to the ground state energy of the hydrogen atom.

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Answer:

Correct Answer: 48. (b,d)

Solution:

  1. Assertion is correct Be(1s2,2s2) has stable electronic configuration, removing an electron require more energy than the same for B(2p1). Reason is incorrect (Aufbau principle).


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