Assertion: E° for Mn3+ /Mn2+ is more positive than Cr3+ /Cr2+
Reason: The third ionization energy of Mn is larger than that of Cr.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Explanation:
Reduction potential of Mn3+ is more than Cr3+. So, Mn3+ is easily reduced in comparision with Cr3+ or Cr2+ is easily oxidised than Mn2+. Hence Mn2+ will lose electrons with difficulty or ionisation potential of Mn2+ is more than Cr2+. Both A and R are true.