JEE Chemistry Coordination Compounds MCQs Set 03

Question. Which of the following is the limitation of crystal field theory?
(i) Ligands are assumed as point charges.
(ii) It does not accounts for the covalent character of bonding between the ligand and the central atom.
(iii) It does not explain how colour of coordination compounds depends on ligand attached to central metal atom/ion.
(a) (i) and (ii)
(b) (ii) only
(c) (ii) and (iii)
(d) (i), (ii) and (iii)

Answer: A

Question. If magnetic moment of [MnBr₄]^2– is 5.9 BM. Predict the number of electrons?
(a) 5
(b) 3
(c) 2
(d) 6

Answer: A

Question. The charge on the central metal ion in the complex [Ni(CO)₄] is
(a) 0
(b) + 2
(d) + 3

Answer: A

Question. The unpaired electrons in Ni(CO)₄ are
(a) zero
(b) three
(c) one
(d) four

Answer: A

Question. The correct structure of Fe(CO)₅ is (Z=26 for Fe)
(a) trigonal pyramidal
(b) tetrahedral
(c) octahedral
(d) square pyramidal

Answer: A

Question. Coordination compounds have great importance in biological systems. In this context which of the following statements is incorrect ?
(a) Chlorophylls are green pigments in plants and contain calcium
(b) Haemoglobin is the red pigment of blood and contains iron
(c) Carboxypeptidase - A is an exzyme and contains zinc
(d) None of these

Answer: A

Question. Which one of the following coordination compounds is used to inhibit the growth of tumours?
(a) Cis-platin
(b) EDTA complex of calcium
(c) Trans-platin
(d) None of these

Answer: A

Question. For [Co₂(CO)₈], what is the total number of metal – carbon bonds and number of metal–metal bonds
(a) 10 ,1
(b) 8, 1
(c) 8, 2
(d) 10, 0

Answer: A

Question. Identify the correct statements for the behaviour of ethane- 1, 2-diamine as a ligand.
(i) It is a neutral ligand.
(ii) It is a didentate ligand.
(iii) It is a chelating ligand.
(iv) It is a unidentate ligand.
(a) (i), (ii) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iii)
(d) (i), (iii) and (iv)

Answer: A

Question. Read the following statements
(i) Macromolecules cannot behave as a ligand.
(ii) [EDTA]^4– can bind through two oxygen and four nitrogen atom.
(iii) Chelate complexes are more stable than similar complexes containing unidentate ligands.
(iv) Coordination number of the central atom/ion is determined only by the number of sigma bonds formed by the ligand with central atom/ion
Which of the following is the correct code for statements above?
(a) FFTT
(b) TFTF
(c) FTFT
(d) FFFT

Answer: A

Question. Which of the following statements regarding formulas and naming of coordination compounds are correct?
(i) During nomenclature names of neutral ligands are kept same except for H₂O, NH₃ and CO.
(ii) If the complex is anion, the name of the metal ends with the suffix–ate.
(iii) While writing formula of coordination compounds polydentate ligands are listed alphabeticaly.
(iv) The cation is named first in both positively and negatively charged coordination entities.
(a) (i), (ii), (iii) and (iv)
(b) (ii), (iii) and (iv)
(c) (i), (ii) and (iii)
(d) (i), (iii) and (iv)

Answer: A

Question. Total number of electron count in Ni(CO)₄ and Fe(CO)₅ respectively are
(a) 36, 36
(b) 36, 34
(c) 34, 36
(d) 34, 34

Answer: A

Question. According to IUPAC nomenclature sodium nitroprusside is named as
(a) Sodium pentacyanonitrosylferrate (III)
(b) Sodium nitroferrocyanide
(c) Sodium nitroferricyanide
(d) Sodium pentacyanonitrosylferrate (II)

Answer: A

Question. For which value of the x, and y, the following square planar compound shows geometrical isomers [Pt (Cl)_x (Br)_y]^2–
(a) 3, 1
(b) 1, 1
(c) 1, 3
(d) 2, 2

Answer: A

Question. How many geometrical isomers are possible for following square planar compound [M (Cl) (Br) (I) (F)] (where M is a metal ion)
(a) 3
(b) 8
(c) 2
(d) 9

Answer: A

Question. The terahedral complex [M(A)(B)(X)(Y)], where A,B,X and Y are different ligands and M is a metal ion is
(a) rotate plane polarized light
(b) incomplete information
(c) can’t be said
(d) optically inactive

Answer: A

Question. The correct statement with respect to the complexes Ni(CO)₄ and [Ni(CN)₄]^2– is
(a) have tetrahedral and square planar geometry respectively
(b) both have square planar geometry
(c) both have tetrahedral geometry
(d) nickel is in the same oxidation state in both

Answer: A

Question. Both [Ni(CO)₄] and [Ni(CN)₄]^2– are diamagnetic. The hybridisations of nickel in these complexes, respectively, are
(a) sp³, dsp²
(b) dsp², sp²
(c) sp³, sp³
(d) dsp², sp³

Answer: A

Question. According to valence bond theory which of the following statement is correct about the complexes Ni(CO)₄ and [Ni(CN)₄]^2– if both are diamagnetic in nature
(a) one is tetrahedral and other is square planar
(b) one is square planar and other is tetrahedral
(c) both are square planar
(d) both are tetrahedral

Answer: A