AIIMS 2018 Chemistry Crystal Field Stabilization Energy MCQ Question
Assertion : while converting, colour continuously changes.
Reason : CFSE is increases during change.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The CFSE (Crystal Field Stabilization Energy) value for [Cr(H₂O)₆]²⁺ is higher at –0.6Δ₀ compared to [Cr(H₂O)₆]³⁺, which has a CFSE of –1.2Δ₀. This indicates that [Cr(H₂O)₆]²⁺ experiences less stabilization due to its higher number of unpaired electrons in the 3d subshell, leading to a less negative CFSE value. Option B is incorrect because it suggests that [Cr(H₂O)₆]³⁺ has a higher CFSE, which contradicts the provided values. Options C and D are also incorrect, as the CFSE values can indeed be compared based on their numerical values.
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