Consider the following complex ions:
, ,
The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is:

Question

Consider the following complex ions:
, , 
The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is:

Canvas Classes · Accepted Answer

Strategy:
 Since all ligands (, ) are weak field ligands, all complexes will be high spin. Count the unpaired electrons () for each to correlate with the magnetic moment ().

Step 1: Determine unpaired electrons
- P= :  is . High spin  has 5 unpaired electrons. ().
- Q= :  is . High spin  has 3 unpaired electrons. ().
- R= :  is . High spin  () has 4 unpaired electrons. ().

Step 2: Order
Increasing order of  corresponds to increasing order of :
3 unpaired < 4 unpaired < 5 unpaired.
Q < R < P.

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