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JEE Main201912 Jan 2019Morning ShiftChemistryCoordination CompoundsActual

The pair of metal ions that can give a spin only magnetic moment of 3.9   B M for the complex [ M ( H 2 O ) 6 ] C l 2 , is:

Options

  1. AC o 2 + and F e 2 +
  2. BV 2 + and F e 2 +
  3. CC r 2 + and M n 2 +
  4. DV 2 + and C o 2 +

Correct answer

D. V 2 + and C o 2 +

Step-by-step solution

If the complex is M H 2 O 6 C l 2 ,   M will have + 2 oxidation state and hence, it has already lost 2 electrons from s - orbital. Since it has μ = 3.9 = n ( n + 2 ) ⇒ n = 3 3 unpaired so, the configuration can either be:

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