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Question

Assertion :Transition metal ion forming octahedral complexes undergo sp3d2 or d2sp3 hybridisation. Reason: Strong field ligands force the unpaired electrons of central metal ion to pair up causing d2sp3 hybridisation whereas weak field ligands do not affect electronic configuration of the metal ion undergoes in sp3d2 hybridisation.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Transition metal ion forming octahedral complexes undergo either sp3d2 or d2sp3 hybridization.
Hence, the assertion is correct.
In presence of strong field ligands, the unpaired electrons of the metal pair up which results in d2sp3 hybridization.
In presence of weak field ligands, the unpaired electrons of the metal do not pair up which results in sp3d2 hybridization.
Thus the reason is correct. It is correct explanation of the assertion.

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