Question

Which of the following complex compounds will exhibit
highest paramagnetic behaviour?
(At. No. : Ti = 22, Cr = 24, Co = 27, Zn = 30)
(a) [Ti (NH₃)₆]³⁺ (b) [Cr (NH₃)₆]³⁺
(c) [Co (NH₃)₆]³⁺ (d) [Zn (NH₃)₆]²⁺

Answer 1

I think the correct answer is (b)

Answer 2

Complex compounds which will exhibit

highest paramagnetic behaviour is :

At. No. : Ti = 22, Cr = 24, Co = 27, Zn = 30

(a) [Ti (NH₃)₆]³⁺

At. no. of Ti = 22

Electronic configuration of Ti³⁺ = [Ar]3d1

No. of unpaired electron = 1

(b) [Cr (NH₃)₆]³⁺

At. no.of Cr = 24

Electronic configuration of Cr³⁺ = [Ar]3d3

No. of unpaired electrons = 3

(c) [Co (NH₃)₆]³⁺

At. no. of Co = 27

Electronic configuration of Co³⁺ = [Ar]3d6

No. of unpaired electrons = 4

(d) [Zn (NH₃)₆]²⁺

At. no. of Zn = 30

Electronic configuration of Zn³⁺ = [Ar]3d9

No. of unpaired electrons = 1

Ans is [Co (NH₃)₆]³⁺