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JEE Main · 2021 · 17 Mar 2021 · Shift 1 · d and f Block Elements

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What is the spin- only magnetic moment value (BM) of divalent metal ion with atomic number 25, in it's aqueous solution?
  1. (A)5.26
  2. (B)zero
  3. (C)5.92✓ Correct
  4. (D)5.0

Answer: (C)

Solution

Atomic number 25 is manganese, and has the configuration . Water is a weak-field ligand, so the aqua ion is high spin and all five electrons remain unpaired. The spin-only moment follows as

which is BM.

JEE Main · 2021 · 17 Mar 2021 · Shift 1 · Single correct option

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