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JEE Main20254 Apr 2025Morning ShiftChemistryCoordination CompoundsActual

Which one of the following complexes will have ₀=0 and =5.96 B.M.?

Options

  1. A[ Fe ( CN )₆ ]^4
  2. B[ CO ( NH ₃ )₆ ]³⁺
  3. C[ FeF ₆ ]^4
  4. D[ Mn ( SCN )₆ ]^4

Correct answer

D. [ Mn ( SCN )₆ ]^4

Step-by-step solution

(1) [ Co ( NH ₃ )₆ ]³⁺ Co ³⁺ 3 ~d ^6 4 ~s ^0 =[-0.4 6+0.6 (0)] ₀=-2.4 ₀ (2) aligned & [ Mn ( SCN )₆ ]^4 & Mn ²⁺ 3 ~d ^5 4 ~s ^0 aligned aligned & = 35 B.M. =5.96 B.M. & CFSE =(-0.4 3+0.6 2) ₀ aligned So ₀=0 (3) aligned & [ Fe ( CN )₆ ]⁻⁴ Fe ²⁺ 3 ~d ^6 4 ~s ^0 aligned CFSE =-2.4 ₀ (4) [ FeF ₆ ]⁴⁻ Fe ²⁺ 3 ~d ^6 4 ~s ^0 aligned & = 24 B.M. =4.89 B.M. & CFSE =(-0.4 4+0.6 2) ₀=-1.2 ₀ aligned

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