AIIMS2019Chemistryd and f Block Elements
Assertion : Yb ²⁺ is more stable as compare to Gd ²⁺ . Reason : The electronic configuration of Gd is [ Xe ] 4 f^7 5 d^2 6 s^2 .
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIf both assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- DIf both assertion and reason are false.
Correct answer
C. If assertion is true but reason is false.
Step-by-step solution
aligned & Yb ²⁺=[ Xe ] 4 f¹⁴ 5 d^0 6 s^0 & Gd ²⁺=[ Xe ] 4 f^7 5 d^1 6 s^0 aligned Because of fully filled 4 f orbital, Yb ²⁺ is more stable than Gd ²⁺ .