Periodic Classification and Periodic Properties 2 Question 33
Assertion and Reason
Read the following questions and answer as per the direction given below :
(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.
33.
Statement I: The first ionisation energy of $\mathrm{Be}$ is greater than that of B.
Statement II: $2 p$-orbital is lower in energy than $2 s$.
(2000, (S), 1M)
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Answer:
Correct Answer: 33. (c)
Solution:
- Statement $I$ is true $B e$ has higher first ionisation energy than $B$ which is against periodic trend.
Statement II is false $2 s$-orbital is lower in energy than $2 p$, Aufbau’s principle.
BETA
