AIIMS 2018 Chemistry Ligand Substitution Reactions Assertion Reason Question
Assertion: [Co(NH₃)₆]³⁺ → [Co(NH₃)₅H₂O]³⁺ colour continuously changes. Reason: Larger wavelength will be absorbed
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 assertion is true because the complex ion [Co(NH₃)₆]³⁺ can undergo a color change as it transitions to [Co(NH₃)₅H₂O]³⁺ due to the ligand substitution, which affects the d-orbital splitting and thus the color observed. The reason is also true, as larger wavelengths correspond to lower energy transitions in the visible spectrum, which explains the observed color change. Options B, C, and D are incorrect because they either misinterpret the relationship between the assertion and reason or incorrectly state the truth of one or both statements.
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