Coordination Compounds · Question 55

Match List - I with List - II. Choose the correct answer from the options given below :

1. (A)-(III), (B)-(I), (C)-(I), (D)-(IV)
2. (A)-(III), (B)-(II), (C)-(III), (D)-(IV)
3. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
4. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Answer

(3) (A)-(IV), (B)-(II), (C)-(I), (D)-(III)

Solution

(A) [MnBr4]2-: Mn2+, 3d5; Br- is weak field, tetrahedral sp3, 5 unpaired electrons, paramagnetic (IV)

(B) [FeF6]3-: Fe3+, 3d5; F- is weak field, outer orbital complex sp3d2, 5 unpaired electrons, paramagnetic (II)

(C) [Co(C2O4)3]3-: Co3+, 3d6; oxalate pairs the electrons (as per NCERT, low-spin like [Co(NH3)6]3+) d2sp3, no unpaired electron, diamagnetic (I)

(D) [Ni(CO)4]: Ni(0), 3d8 4s2 3d10 (CO pairs the electrons) sp3, tetrahedral, diamagnetic (III)

(A)-(IV), (B)-(II), (C)-(I), (D)-(III)

Answer: (3)