Coordination Compounds MCQ Questions - PDF Download

Coordination Compounds
MCQs for CSIR NET & GATE
Assignment-9

This is 9th MCQ Assignment on Coordination Compounds. It contains full chapter MCQ questions from chapter Coordination Compounds. The MCQ questions have been asked in previous year exams such as CSIR NET, GATE, GRE, TOEFL etc. You can download the assignment as PDF file or can attempt it as a quiz as well.

      

Q1. Ba[Ni(CN)₄] and Mg[NiF₄] complex ions are:
a) both diamagnetic
b) both paramagnetic
c) diamagnetic and paramagnetic respectively
d) paramagnetic and diamagnetic respectively.

Q2. High spin complex of a 3d-metal ion M has a magnetic moment of 2.9 B.M. in octahedral environment and 4.1 B.M. in tetrahedral. The M ion is:
a) Cu2+
b) Co3+
c) Co2+
d) Ni2+

Q3. In the following electronic transitions, the forbidden transitions are:
I. 1Σu+ → 1Σg+
II. 1Δu → 1Σg+
III. 1π → 1Σu+
IV. 1Σg+ → 3Σg+
a) I and III
b) I, III, IV
c) II and IV
d) II, IV, III

Q4. Ground state term of high spin octahedral and tetrahedral Co2+ complexes are; respectively
a) 4T1g and 4A2
b) 4T2g and 4A2
c) 3T1g and 4A2
d) 4T2g and 3T1

Q5. A in below reaction is 

Q6. For this cross reaction, the self-exchange rates for oxidant and reductant are 4.2 L mol-1 s-1 and 4 × 103 L mol-1 s-1 and Keq = 2 × 1011 and f = 0.85

The approximate rate constant (L mol-1 s-1) for this reaction is:
a) 5.4 × 107
b) 3.16 × 106
c) 6.32 × 106
d) 3.16 × 104

Q7. Lowest energy term for low spin d5 is:
a) 6s
b) 2I
c) 2H
d) 6F

Q8. In the reaction given below, electron transfer occurs via transition: 

a) σ*→π*
b) π*→σ*
c) π*→π*
d) σ*→σ*

Q9. Arrange the following compounds in increasing order of molar absorbance
(i) MnO₄- 
(ii) [Mn(H₂O)₆]2+
(iii) [Ti(H₂O)₆]3+ 
(iv) [CoCl₄]2-
a) (i) > (iii) > (iv) > (ii)
b) (iv) > (i) > (iii) > (ii)
c) (i) > (iv) > (iii) > (ii)
d) (iv) > (i) > (ii) > (iii)

Q10. The crystal field splitting energy for CoCl₆4- is 27000 cm-1. The ∆ for [Co Cl₄]2- would be
a) 143 KJ mol-1
b) 12000 cm-1
c) 16000 cm-1
d) both (a) and (b)

Q11. Mg Al₂O₄ and Fe [NiFe]O₄ are respectively
a) both normal spinals
b) both inverse spinals
c) normal, inverse
d) inverse, normal

Q12. Calculate the difference between spin-only magnetic moment and effective magnetic moment for [Ni (en)₃]2+
Given: spin-orbit coupling constant is -315 cm-1 and crystal field splitting energy is 11500 cm-1, 3A2g is the ground state
a) 0.31
b) 2.80
c) 3.10
d) 1.10

Q13. Which of the following complexes are kinetically labile?
P. [V(NH₃)₆]3+ 
Q. [Co(CN)₆]3-
R. [MnCl₆]3- 
S. [Cr(CN)₆]3-
a) Q, S
b) P, S
c) Q, R
d) P, R

Q14. Which of the following statement is not true for [Ni (CN)₅]3-?
a) Axial bond is longer than equitorial
b) dz2 has higher electron density than d_x²-y²
c) all M-L bonds are equal in length
d) It is square pyramidal complex

Q15. The correct order of electrical conductance measurement for the following coordination compounds
(i) [Co (NH₃)₄ Cl₂] Cl
(ii) [Co (NH₃)₃ Cl₃]
(iii) [Co (NH₃)₆] Cl₃
a) i > ii > iii
b) ii > i > iii
c) iii > i > ii
d) iii > ii > i

Q16. Which of the following octahedral complex shows 3T2g ← 3A2g transition as the lowest energy visible band in its electronic spectrum?
a) [Cr (NH₃)₆]3+
b) [Fe F₆]3-
c) [Co (NH₃)₆]3+
d) [Ni (H₂O)₆]2+

Q17. The total no. of stereoisomers for [Co(gly)₂Cl₂]- are
a) 6
b) 5
c) 8
d) 9

Q18. The total no. of microstates in 3T_2g are:
a) 21
b) 9
c) 45
d) 3

Q19. The distance between d_xy, d_yz and d_xz orbitals and the nearest ligand in tetrahedral complex is

Q20. Which of the following is most stable?
a) cis-[Cu (en)₂Cl₂]
b) [Cu (en)₃]2+
c) trans-[Cu (en)₂Cl₂]
d) [Cu (H₂O)₆]2+

Answer Key 

1c 2d 3c 4a 5b 6a 7b 8c 9c 10d 11c 12a 13d 14c 15c 16d 17c 18b 19b 20c