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JEE Main202621 January 2026Evening ShiftChemistryCoordination CompoundsActual

Given below are two statements : Statement I : Crystal Field Stabilization Energy (CFSE) of [ Cr ( H ₂ O )₆ ]²⁺ is greater than that of [ Mn ( H ₂ O )₆ ]²⁺ . Statement II : Potassium ferricyanide has a greater spin-only magnetic moment than sodium ferrocyanide. In the light of the above statements, choose the correct answer from the options given below :

Options

  1. ABoth Statement I and Statement II are true
  2. BBoth Statement I and Statement II are false
  3. CStatement I is true but Statement II is false
  4. DStatement I is false but Statement II is true

Correct answer

A. Both Statement I and Statement II are true

Step-by-step solution

[ Mn ( H ₂ O )₆ ]²⁺ CFSE value is zero because of d ^5 configuration with Weak Field Ligands in coordination number 6 [ Cr ( H ₂ O )₆ ]²⁺ . [ Cr ( H ₂ O )₆ ]²⁺ CFSE value is -0.6 ₀ because of d ^4 configuration with Weak Field Ligands in coordination number 6. For : K ₃ [ Fe ( CN )₆ ], = 1(1+2) = 3 B.M. For : Na ₄ [ Fe ( CN )₆ ], = 0 B.M.

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