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JEE Main202125 Jul 2021Morning ShiftChemistryCoordination CompoundsActual

Which one of the following species responds to an external magnetic field?

Options

  1. AFe H 2 O 6 3 +
  2. BNi CN 4 2 -
  3. CCo CN 6 3 -
  4. DNi CO 4

Correct answer

A. Fe H 2 O 6 3 +

Step-by-step solution

1. Fe H 2 O 6 3 + Fe 3 +   :   Ar 3 d 5 Hybridisation : sp 3 d 2 Magnetic nature : Paramagnetic (so this complex response to external magnetic field) 2. Ni CN 4 2 - Ni 3 +   :   Ar 3 d 8 Hybridisation : dsp 2 Magnetic nature : diamagnetic 3. Co CN 6 3 - Co 3 +   :   Ar 3 d 6 Hybridisation : d 2 sp 3 Magnetic nature : diamagnetic 4. Ni CO 4 Ni   :   Ar 3 d 8   4 s 2 Hybridisation : sp 3 Magnetic nature : diamagnetic

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