JEE Mains Chemistry Past PapershardMCQ SINGLE

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as ReasoJEE Mains Chemistry Past Papers Chemistry Question

Question

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In aqueous solutions Cr2+ is reducing while Mn3+ is oxidising in nature. Reason (R) : Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration. In the light of the above statement, choose the most appropriate answer from the options given below: (A) Both (A) and (R) are true and (R) is the correct explanation of (A) (B) Both (A) and (R) are true but (R) is not the correct explanation of (A) (C) (A) is false but (R) is true (D) (A) is true but (R) is false

Answer: A

💡 Solution & Explanation

Cr2+ is reducing as it configuration changes from d4 to d3 due to formation of Cr3+, which has half filled t2g level, on other hand, the change Mn3+ to Mn2+ result half filled d5 configuration which has extra stability. $//(1® Final JEE-Main Exam January, 2024/01-02-2024/Ev

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