AIIMS 2019 Chemistry Exchange Energy MCQ Question
Which of the following is incorrect about cyanogen gas?
It has bent structure
It is psuedohalogen.
Its behavior is similar to halides.
both carbon are sp hybridised
Correct Answer
Detailed Explanation
The d⁵ electron configuration is highly stable due to the maximum number of unpaired electrons, which allows for greater exchange energy and minimizes electron-electron repulsion. In contrast, the d⁴ configuration has fewer unpaired electrons, leading to lower exchange energy and reduced stability. Therefore, option A is correct, as it accurately reflects the stability associated with the d⁵ configuration compared to d⁴. Options B, C, and D are incorrect because they do not recognize the fundamental principles of exchange energy and electron configuration stability in transition metals.
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