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AIIMS 2011
Exam
AIIMS
Year
2011
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2011 · Chemistry · d and f Block Elements

Assertion : Reduction potential of Mn (+3 to +2 ) is more positive...

Assertion : Reduction potential of Mn (+3(+3 to +2)) is more positive than Fe (+3(+3 to +2)). Reason : Ionisation potential of Mnis more than that of Fe\mathrm{Fe}.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

\mathrm{Mn}^{2+}=[\mathrm{Ar}] 3 d^5Mn3+=[Ar]3d4Fe3+=[Ar]3d5\begin{aligned}& \mathrm{Mn}^{3+}=[\mathrm{Ar}]3 d⁴ \\ & \mathrm{Fe}^{3+}=[\mathrm{Ar}]3 d⁵ \end{aligned} Fe2+=[Ar]\mathrm{Fe}^{2+}=[\mathrm{Ar}]3 d⁶ , \text{, }Thus, Mn2+\mathrm{Mn}^{2+} has more stable configuration than Mn3+\mathrm{Mn}^{3+} while Fe3+\mathrm{Fe}^{3+} has more stable configuration than Fe2+\mathrm{Fe}^{2+}. Hence, reduction potential for Mn3+/Mn2+\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+} couple is more positive than Fe3+/Fe2+\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}.
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