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JEE Main202227 Jun 2022Evening ShiftChemistryCoordination CompoundsActual

Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: Mn = 25 ; Fe = 26 ) A. FeF 6 3 - B. Fe CN 6 3 - C. MnCl 6 3 - (high spin) D. Mn CN 6 3 - Choose the correct answer from the options given below

Options

  1. AA < B < D < C
  2. BB < D < C < A
  3. CA < C < D < B
  4. DB < D < A < C

Correct answer

B. B < D < C < A

Step-by-step solution

Magnetic moment is directly proportional to the number of unpaired in the central metal atom of a complex. It is calculated by the formula, μ = n ( n + 2 ) BM (A) FeF 6 3 - Fe + 3 → 3 d 5 4 s 0 n = 5 (B) Fe CN 6 3 - Fe + 3 → 3 d 5 4 s 0 n = 1 (C) MnCl 6 3 - Mn + 3 → 3 d 4 4 s 0 n = 4 (D) Mn CN 6 3 - Mn + 3 → 3 d 4 4 s 0 n = 2 Hence ,   correct   order   of   magnetic   moment   is   A > C > D > B

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