NTA Abhyas JEE Main2020ChemistryCoordination CompoundsPractice
Which one among the following complex ions has the highest paramagnetism?
Options
- AC r ( H 2 O ) 6 3 +
- BF e ( H 2 O ) 6 2 +
- CC u H 2 O 6 2 +
- DZ n H 2 O 6 2 +
Correct answer
B. F e ( H 2 O ) 6 2 +
Step-by-step solution
μ = n ( n + 2 ) B M , n is number of unpaired electrons. [ F e ( H 2 O ) 6 ] 2 + has four unpaired electrons, [ C r ( H 2 O ) 6 ] 3 + , [ C u ( H 2 O ) 6 ] 2 + and [ Z n ( H 2 O ) 6 ] 2 + have 3, 1, 0 unpaired electrons respectively.