Consider the following complex ions P, Q and R. P = [ F e F 6 ] - 3 , Q = [ V ( H 2 O ) 6 ] 2 + and R = [ F e ( H 2 O ) 6 ] 2 + 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 P, Q and R. P = [ F e F 6 ] - 3 , Q = [ V ( H 2 O ) 6 ] 2 + and R = [ F e ( H 2 O ) 6 ] 2 + The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is, R Q P, Q R P, R P Q, Q P R

MARKS App · Accepted Answer

P = [ F e F 6 ] 3 - i.e. F e + 3 = [ A r ] 3 d 5 so, n = 5 Magnetic moment = n ( n + 2 ) B M = 5 ( 5 + 2 ) = 35 B M Q = [ V ( H 2 O ) 6 ] + 2 , V + 2 = [ A r ] 3 d 3 , n = 3 Magnetic moment = n ( n + 2 ) B M = 3 ( 3 + 2 ) = 15 B M R = [ F e ( H 2 O ) 6 ] + 2 i.e. F e + 2 = [ A r ] 3 d 6 , n = 4 Magnetic moment = 4 ( 4 + 2 ) = 24 B M Hence the order is P > R > Q

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