1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the following complex ions, P, Q and R. P=[FeF6]3-,Q=[V(H2O)6]2+ and R=[Fe(H2O)6]2+ The correct order of the complex ions, according to their spin-only magnetic moment values (in B.M.) is

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Q. Consider the following complex ions, $P, Q$ and $R$.
$P=[FeF_6]^{3-},Q=[V(H_2O)_6]^{2+} and \, R=[Fe(H_2O)_6]^{2+} $
The correct order of the complex ions, according to their spin-only magnetic moment values (in $B.M.$) is

JEE AdvancedJEE Advanced 2013Coordination Compounds

Solution:

PLAN Spin only magnetic moment have the formula $\sqrt {n(n+2)} BM, $
where N is tr.e number of unpaired electrons. In the presence of
weak ligand (as $H_2O,CI^-,F^-) $ there is no pairing of electrons,
and electrons donated by ligands are filled in outer vacant
orbitals
In the presence of strong ligand (as $CN^-,CO,NH_3,en) $
electrons are paired and electrons from ligands are filled in
available inner orbitals
Thus, order of spin-only magnetic moment = Q < R < P

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