Jahn Teller Distortion
MCQs for NET & GATE
Topic wise Assignment-3
Q1. Which one of the following octahedral complexes will be distorted?
(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
(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?
(b) d4, d9
(c) d5, d9
(d) d6, d9
Q6. For the complexes
(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
(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
(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+
(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
(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.bQ6.d Q7.a Q8.c Q9.a,b Q10.b
Q11.c Q12.a