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Assertion A: Third ionisation enthalpy of Fe is lower than that of Mn.
Reason R: Mn has more number of oxidation states than Fe

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Both Assertion & Reason are correct but Reason is not correct explanation for Assertion

Both Assertion & Reason are correct and Reason is correct explanation for A

Assertion is correct but Reason is wrong

Both Assertion & Reason are wrong

answer is B.

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Detailed Solution

Third ionization enthalpy of Fe is lower than that of Mn due to half filled (d⁵) d-orbital configuration of Mn not for more number of oxidation states of Mn.

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