Question

Which of the following group of ions is paramagnetic in nature :

• A. Cu+, Zn2+, Sc3+
• B. Mn2+, Fe3+, Ni2+
• C. Cr2+, Mn3+, Sc3+
• D. Cu2+, Ni2+, Ti4+

Answer 1

Answer: (B)

Mn2+, Fe3+, Ni2+

Answer 2

(1) Cu+[Ar]18 3d10 , so n = 0 ; Zn2+ [Ar]18 3d10 , so n = 0 ; Sc3+ [Ar]18 3d0 , so n = 0

(2) Mn2+ [Ar]18 3d5 , so n = 5 ; Fe3+ [Ar]18 3d5 , so n = 5 ; Ni2+ [Ar]18 3d8 , so n = 2

(3) Cr2+ [Ar]18 3d4 , so n = 4 ; Mn3+ [Ar]18 3d4 , so n = 4 ; Sc3+ [Ar]18 3d0 , so n = 0

(4) Cu2+ [Ar]18 3d9 , so n = 1 ; Ni2+ [Ar]18 3d8 , so n = 2; Ti4+ [Ar]18 3d0 , so n = 0