Question

Q.14.Which of the following has maximum number of unpaired electrons?​

Answer 1

Answer: Fe3+

Explanation:

Atomic number of Fe is 26

Its configuration can be written as

(Ar) 4s2 3d6

Fe2+ indicates it has lost 2 electron which goes from 4s ,

Resulting in

Fe2+ (Ar) 3d6

Where unpaired electron is 4

Because remaining 2 electrons will be paired

Fe3+ (Ar) 3d5 it has 5 unpaired electrons ( each d orbital singly filled)

Co atno. Is 27 (Ar) 4s2 3d7

Co 2+ (Ar) 3d7 it has 3 unpaired electrons

Co 3+ (Ar) 3d6 with 4 unpaired electron

Answer 2

Answer:

Fe3+

Explanation:

Fe3+ because it has maximum number of unpaired electron that is 5

Whereas in Fe2+ have 4 unpaired electron

Co2+ have 3 unpaired electrons

Co3+ have 4 unpaired electrons.