Consider the following low-spin complexes K ₃ [ Co ( NO ₂ )₆ ], K ₄ [ Fe ( CN )₆ ] , K ₃ [ Fe ( CN )₆ ], Cu u₂ [ Fe ( CN )₆ ] and Zn ₂ [ Fe ( CN )₆ ] The sum of the spin-only magnetic moment values of complexes having yellow colour is. _____ B.M. (answer in nearest integer)

Step-by-step solution

K ₃ [ Co ( NO ₂ )₆ ]= Yellow Co ³⁺=3 ~d ^6 t _ 2 ~g ^6 e _ g ^0 aligned & K ₄ [ Fe ( CN )₈ ]= Yellow Fe ²⁺=3 ~d ^6 t _ 2 ~g ^6 e _ g ^0 & ~K ₃ [ Fe ( CN )₈ ]= Bright Red Fe ³⁺=3 ~d ^5 t _ 2 ~g ^5 e _ g ^0 & Cu ₂ [ Fe ( CN )₈ ]= Chocolate brown & Zn ₂ [ Fe ( CN )₈ ]= White aligned Spin only magnetic moment of complex having Yellow colour is zero.