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Question

Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)
  1. Cr2+
  2. Ti3+
  3. Co2+
  4. Ni2+


Solution

The correct option is D Ni2+
Magnetic moment (μ)=n(n+2)=2.84 B.M , which corresponds to 2 unpaired electrons. 
Cr2+3d4, 4 unpaired electrons
Co2+3d7, 3 unpaired electrons
Ni2+3d8, 2 unpaired electrons
Ti3+3d1, 1 unpaired electron

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