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MHT CET202613 April 2026Evening ShiftChemistryd and f Block ElementsActual

Which of the following ions exhibit same value of spin only magnetic moment? (A). Ti ³⁺ (B). Cr ³⁺ (C). Mn ²⁺ (D). Fe ³⁺ (E). Sc ³⁺ Choose the most appropriate answer from the options given below.

Options

  1. A(B) and (D) only
  2. B(A) and (E) only
  3. C(C) and (D) only
  4. D(A) and (D) only

Correct answer

C. (C) and (D) only

Step-by-step solution

Electronic configuration of the given ions and their number of unpaired electrons ( n ): Ti ³⁺ : [ Ar ] 3d^1 n = 1 Cr ³⁺ : [ Ar ] 3d^3 n = 3 Mn ²⁺ : [ Ar ] 3d^5 n = 5 Fe ³⁺ : [ Ar ] 3d^5 n = 5 Sc ³⁺ : [ Ar ] 3d^0 n = 0 The spin-only magnetic moment is given by = n(n+2) BM. Since Mn ²⁺ and Fe ³⁺ have the same number of unpaired electrons ( n = 5 ), they exhibit the same spin-only magnetic moment of 35 BM. Therefore, (C) and (D) only is the correct choice. Answer: (C) and (D) only

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