1.

The correct order of the spin only magnetic moment of metal ions in the following low spin complexes,[V(CN)₆]⁴⁻ , [Fe(CN)₆]⁴⁻ , [Ru (NH₃)₆]³⁺, and [Cr(NH₃)₆]²⁺ , is: (A) Cr²⁺ > Ru³⁺ > Fe²⁺ > V²⁺ (B) V²⁺ > Cr²⁺ > Ru³⁺ > Fe²⁺ (C) Cr²⁺ > V²⁺ > Ru³⁺ > Fe²⁺ (D) V²⁺ > Ru³⁺ > Cr²⁺ > Fe²⁺

Answer»

The correct order of the spin only magnetic moment of metal ions in the following low spin COMPLEXES is the one in option B ( V²⁺ > Cr²⁺ > Ru³⁺ > Fe²⁺ ).

  • Low spin complexes are the one in which pairin of electrons TAKES place in the lower t2g levels before electrons are FILLED in the HIGHER eg levels of the d-orbitals.
  • The magnetic moment of an ion INCREASES with an increase in the number of unpaired electrons in the metal ion.
  • The number of unpaired electrons in the low spin complexes of  V²⁺,Cr²⁺,Ru³⁺ and Fe²⁺ is equal to 3,2,1 and 0 respectively.
  • Hence, the order of the  magnetic moment follows from the above numbers of the unpaired electrons in the metal ions.


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