Atomic Structure - Result Question 72
Assertion and Reason
Read the following questions and answer as per the direction given below :
(a) Both Statement I and Statement II are correct; Statement II is the correct explanation of Statement I
(b) Both Statement I and Statement II are correct; Statement II is not the correct explanation of Statement I
(c) Statement I is correct; Statement II is incorrect
(d) Statement I is incorrect; Statement II is correct
48.
Statement I The first ionisation energy of Be is greater than that of B.
Statement II $2 p$-orbital is lower in energy than $2 s$.
(2000)
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Answer:
Correct Answer: 48. (c)
Solution:
- Assertion is correct $\operatorname{Be}\left(1 s^{2}, 2 s^{2}\right)$ has stable electronic configuration, removing an electron require more energy than the same for $B\left(2 p^{1}\right)$. Reason is incorrect (Aufbau principle).
BETA
