JEE · NEET Previous Year Question
Assertion: The first ionization energy of Be is greater than that of B.
Reason: 2p orbital is lower in energy than 2s.
Topic: JEE PYQ
Answer: C. Full step-by-step solution below.
- ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BBoth Assertion and Reason are true but Reason is not correct explanation of Assertion.
- CAssertion is true but Reason is false.
- DAssertion is false but Reason is true.
Correct answer: C
Solution
(c) Be has completely filled stable orbital and thus Be has higher ionisation energy than B. 2s orbital has less energy than 2p orbital. (From (n+l) rule)More Periodic Table & Periodicity PYQs
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