Question

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Answer 1

Explanation:

29. among the following species which contains highest number of unpaired electrons ?

Answer :- Thus Fe2+ is the correct answer.

30. Total number of degenerate orbits in the second excited stated of L|²+ ion is

Answer :- 3

Answer 2

1)Answer : (4) Cr

Exaplanation :

* electronic configuration of Co is

1s^2 ,2s^2 ,2p^6 ,3s^2, 3p^6 ,3d^7, 4s^2.

* electronic configuration of Mn2+ is

1s^2 ,2s^2 ,2p^6 ,3s^2 ,3p^6 ,3d^5.

* electronic configuration of Fe2+ is

1s^2 ,2s^2 ,2p^6 ,3s^2 ,3p^6 ,3d^6.

* electronic configuration of Cr is

1s^2 ,2s^2 ,2p^6 ,3s^2 ,3p^6 ,3d^5 ,4s^1.

*No.of unpaired electrons in Co = 3

*No.of unpaired electrons in Mn2+=5

*No. of unpaired electrons in Fe2+=4

*No. of unpaired electrons in Cr = 6

2)Answer : (2) 3

Explanation :

no. of degenerated orbital = n^2 = 3^2 = 9

=)2nd excited state is n = 3