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Coordination Complexes

GATE Chemistry - Coordination Complexes: Ligands, Isomerism, Nomenclature, Stability, and Applications

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Match the following salt names with their molecular formula
(i) Fischer salt (a) [Pt(NH3)4][PtCl4]
(ii) Zeise’s salt (b) Fe2[Fe(CN)6]
(iii) Magnus’ green salt (c) K3[Co(NO2)6]
(iv) Turnbull’s blue (d) K3[Fe(CN)6]
(v) Gmelin’s salt (e) K[PtCl3(C2H4)]
  1. (i) - c, (ii) - e, (iii) - a, (iv) - b, (v) - d
  2. (i) - c, (ii) - e, (iii) - a, (iv) - d, (v) - b
  3. (i) - d, (ii) - e, (iii) - a, (iv) - c, (v) - b
  4. (i) - d, (ii) - a, (iii) - e, (iv) - c, (v) - d
  5. (i) - c, (ii) - a, (iii) - e, (iv) - b, (v) - d
Question 2 Multiple Choice (Single Answer)

Which of the following are organometallic compounds?

  1. Zn(CN)2
  2. Ni(CO)4
  3. K[PtCl3(C2H4)]
  4. NiCO3
  1. 1 and 2
  2. 2 and 3
  3. 3 and 4
  4. All the above
  5. None of these
Question 3 Multiple Choice (Single Answer)

Consider the following isomerisms

  1. Ionization
  2. Hydrate
  3. Coordination
  4. Geometrical
  5. Optical
    Which of the above isomerisms are exhibited by [Cr(NH3)2(OH)2Cl2]-?
  1. 1 and 5
  2. 2 and 3
  3. 3 and 4
  4. 4 and 5
  5. 1 and 2
Question 4 Multiple Choice (Single Answer)

Assertion: [Cu(en)2]+2 is more stable than [Cu(NH3)4]+2.
Reason: Both these complexes have a square planar shape.

  1. Both A and R is true and R is the correct explanation of A.
  2. Both A and R is true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
  5. Both A and R are false.
Question 5 Multiple Choice (Single Answer)

A ligand having an unshared pair of electrons can be a

  1. positive charge ion
  2. neutral molecule
  3. negative charge ion
  1. 2 and 3
  2. 1 and 3
  3. 1 and 2
  4. All of these
  5. None of these
Question 6 Multiple Choice (Single Answer)

The compound K3[Co(NO2)6] is called

  1. fischer’s salt
  2. potassium hexanitrocobaltate (III)
  3. potassium cobaltinitrite
  1. 1 and 2
  2. 2 and 3
  3. 1 and 3
  4. All of these
  5. None of these
Question 7 Multiple Choice (Single Answer)

Assertion: The ligand N3- is named as nitride.
Reason: It is derived from NH3.

  1. Both A and R is true and R is the correct explanation of A.
  2. Both A and R is true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
  5. Both A and R are false.
Question 8 Multiple Choice (Single Answer)

K4[Fe(CN)6] is used in the identification of
A. Fe+2
B. Cu+2
C. Cd+2

  1. Only (A)
  2. Only (B)
  3. Only (C)
  4. (A) and (B)
  5. All of these
Question 9 Multiple Choice (Single Answer)

Assertion: Ammonia forms the complex ion [Cu(NH3)4]+2 with copper ions in alkaline solution but not in acidic solution.
Reason: In acidic solution, hydration protects copper ions.

  1. Both A and R is true and R is the correct explanation of A.
  2. Both A and R is true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
  5. Both A and R is false.
Question 10 Multiple Choice (Single Answer)

Which of the following statement/s is/are incorrect?
A. Greater is the stability constant of a complex ion, greater is its stability.
B. Greater is the basic character of the ligand, lower is the stability of the complex.
C. Lower is the charge on the metal ion, lower is the stability of the complex.

  1. Only (A)
  2. Only (B)
  3. (A) and (C)
  4. Only (C)
  5. (A) and (B)
Question 11 Multiple Choice (Single Answer)

Match the following columns:

 
Column I 
        </strong>|<strong>Column II</strong>|

|i. Adkins catalyst|a. (H2PtCl6)|
|ii. Speier’s catalyst|b. (Pd/CaCO3/PbO)|
|iii. Qeacon catalyst|c. (RhCl(PPh3)3)|
|iv. Wilkinson catalyst|d. (CuO/CuCl2)|
|v. Lindlar catalyst|e. (Cu2Cr2O5)|

  1. i - b, ii - a, iii - d, iv - c, v - e
  2. i - a, ii - e, iii - d, iv - c, v - b
  3. i - e, ii - a, iii - d, iv - c, v - b
  4. i - d, ii - c, iii - e, iv - a, v - b
  5. i - c, ii - b, iii - c, iv - a, v - d
Question 12 Multiple Choice (Single Answer)

Ferrocene is an example of
A. Sandwiched complex.
B. Pi-bonded complex.
C. A complex in which all the five carbon atoms of cyclopentadiene anion are bonded to the metal.

  1. Only A
  2. Only B
  3. Only C
  4. None of these
  5. All of these
Question 13 Multiple Choice (Single Answer)

Assertion: Glycinate ion is an example of monodentate ligand.
Reason: It contains N as the only donor atom.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
  5. Both A and R are false.
Question 14 Multiple Choice (Single Answer)

Match the following metal ions with their complex compounds?

 
i. Fe+2 a. Vitamin B12
ii. Co+2 b. Haemoglobin
iii. Mg+2 c. Brown ring complex
iv. Fe+ d. Chlorophyll
v. Fe+3 e. Gmelin’s salt
  1. i - a, ii - b, iii - c, iv - e, v - d
  2. i - e, ii - a, iii - d, iv - b, v - c
  3. i - e, ii - a, iii - d, iv - c, v - b
  4. i - b, ii - d, iii - a, iv - c, v - e
  5. i - b, ii - a, iii - d, iv - c, v - e
Question 15 Multiple Choice (Single Answer)

Match the donor sites in the following ligands

 
i. EDTA a. Tridentate
ii. DMG b Tetradentate
iii. Pyridine c. Bidentate
iv. Terpyridine d. Hexadentate
v. Corrole e. Monodentate
  1. i - d, ii - c, iii - e, iv - a, v - b
  2. i - c, ii - d, iii - a, iv - e, v - c
  3. i - e, ii - a, iii - b, iv - e, v - c
  4. i - a, ii - e, iii - c, iv - b, v - d
  5. i - b, ii - d, iii - c, iv - e, v - a
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