Jahn-Teller Distortion (Coordination) MCQs for NET GATE - Download PDF

Vijay Ishwar
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Jahn Teller Distortion
MCQs for NET & GATE

Coordination Compounds
Topic wise Assignment-3

QUIZ             PDF

Q1. Which one of the following octahedral complexes will be distorted?

[GATE 2000]
(a) [Cr(H2O)6]2+
(b) [Cr(H2O)6]3+
(c) [Mn(H2O)6]2+
(d) [Fe(H2O)6]3+

Q2. The compound which exhibit Jahn-teller distortion is
(a) [Mn(H2O)6]2+
(b) [Mn(H2O)6]3+
(c) [Cr(H2O)6]3+
(d) [Fe(CN)6]4-

Q3. The set of ions expected to show Jahn-Teller distortion in their complexes is

[GATE 2006]
(a) Ti(III), Cu(II), High spin Fe(III)
(b) Cu(I), Ni(II), High spin Fe(III)
(c) Cu(II), Low spin Fe(III), Ti(III)
(d) Low-spin Fe(III), Mn(II), Cu(I)

Q4. Which one of the following complexes is Jahn-Teller distorted?
(a) [Co(NH3)6]3+
(b) [Cr(H2O)6]3+
(c) [Cu(H2O)6]2+
(d) [Fe(CN)6]4-

Q5. Which one of the following pairs of electronic configurations of high spin transition metal ions (3d) in an octahedral field undergoes a substantial Jahn-Teller distortion?

[NET June 2011]
(a) d3, d9
(b) d4, d9
(c) d5, d9
(d) d6, d9

Q6. For the complexes

[NET June 2011]
(A) [Ni(H2O)6]2+ (B) [Mn(H2O)6]2+
(C) [Cr(H2O)6]3+ (D) [Ti(H2O)6]3+
the ideal octahedral geometry will not be observed in
(a) A and D
(b) C and D
(c) B only
(d) D only

Q7. Which is the correct statement about the Ni-N bond in [Ni(NH3)6]2+?
(a) All bond lengths are equal
(b) The two axial bonds are longer than four equatorial bonds
(c) The four equatorial bonds are longer than the two axial bonds
(d) None of the bond length are equal

Q8. The observation of equal Cu-O distances in the hexa-coordinated Cu(II) complex: K2Pb[Cu(NO2)6] is best understood in terms of
(a) failure of the Jahn-Teller theorem to predict the structure of this complex
(b) error in the crystallographic estimate of Cu-O distances
(c) dynamic Jahn-Teller distortion of the Cu-O bonds
(d) symmetrical distribution of the nine valence electrons of Cu(II)

Q9. In the solid state, the CuCl53- ion has two types of bonds. These are

[NET Dec 2012]
(a) three long and two short
(b) two long and three short
(c) one long and four short
(d) four long and one short

Q10. Compounds of K2Ba[Cu(NO2)6] (A) and Cs2Ba[Cu(NO2)6] (B), exhibit tetragonal elongation and tetragonal compression respectively. The unpaired electrons in A and B found respectively, in orbitals

[NET Dec 2013]
(a) dz2 and dx2-y2
(b) dx2-y2 and dz2
(c) dz2 and dz2
(d) dx2-y2 and dx2-y2

Q11. Identify the correct statement about [Ni(H2O)6]2+ and [Cu(H2O)6]2+

[NET June 2014]
(a) All Ni-O and Cu-O bond lengths of individual species are equal
(b) Ni-O (equatorial) and Cu-O (equatorial)
(c) All Ni-O bond lengths are equal whereas Cu-O (equatorial) bonds are shorter than Cu-O (axial) bonds
(d) All Cu-O bond lengths are equal whereas Ni-O (equatorial) bonds are shorter than Ni-O (axial) bonds

Q12. The correct statement for Mn-O bond lengths in [Mn(H2O)6]2+ is

[NET Dec 2015]
(a) All bonds are equal
(b) Four bonds are longer than two others
(c) Two bonds are longer than four others
(d) They are shorter than the Mn-O bond in [MnO4]-

Answer Key

Q1.a Q2.b Q3.c Q4.c Q5.b
Q6.d Q7.a Q8.c Q9.a,b Q10.b
Q11.c Q12.a

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