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Coordiation Complexes

Description: GATE Coordination Complexes
Number of Questions: 15
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Tags: GATE Coordination Complexes
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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

Show answer
Correct Option: A
Explanation:

In this option, all salt names are correctly matched with their molecular formulae.

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

Show answer
Correct Option: B
Explanation:

This option is correct because metal carbonyls and zeise’s salt are the example of organometallic compounds.

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

Show answer
Correct Option: D
Explanation:

The complex ion [Cr(NH3)2(OH)2Cl2]- shows cis and trans isomerism out of which cis isomer is optically active, so this option is correct.

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.

Show answer
Correct Option: B
Explanation:

This option is correct because the correct explanation of A is [Cu(en)2]+2 contains two rings whereas there is no any ring in [Cu(NH3)4]+2.

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

Show answer
Correct Option: D
Explanation:

This option is correct because ligand having an unshared pair of electrons can be a positive charge ion or neutral molecule or negative charge ion or group containing a lone pair of electrons.

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

Show answer
Correct Option: D
Explanation:

The complex compound K3[Co(NO2)6] is called fischer’s salt, potassium cobaltinitrite (common name) and also by its IUPAC name potassium hexanitrocobaltate(III).

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.

Show answer
Correct Option: E
Explanation:

This option is correct because N3- is named as azido and it is derived from HN3.

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

Show answer
Correct Option: D
Explanation:

This option is correct because K4[Fe(CN)6] gives blue color with Fe+2 ion, due to Fe2[Fe(CN)6] and also gives chocolate precipitation with Cu+2 due to the formation copper ferrocyanide.

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.

Show answer
Correct Option: B
Explanation:

In acidic solution, NH3 forms a bond with H+ to give NH4+ ion which do not have a lone pair on N to act as a ligand because this ammonia forms the complex ion [Cu(NH3)4]+2 with copper ions in alkaline solution but not in acidic solution, so this option is correct.

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)

Show answer
Correct Option: B
Explanation:

More basic a ligand, greater is the ease with which it can donate its lone pairs of electrons and therefore, greater is the stability of complex, so statement (B) is incorrect.

Match the following columns:

 
Column I
Column II
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

Show answer
Correct Option: C
Explanation:

This option is correct because the column I catalysts are properly matched with column II.

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

Show answer
Correct Option: E
Explanation:

Ferrocene is a sandwiched complex compound in which all the five carbon of cyclopentadiene anion are linked to the metal through pi-bonds.

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.

Show answer
Correct Option: E
Explanation:

Both A and R are false because glycinate ion is a bidentate ligand and it contains N and O as donor atom.

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

Show answer
Correct Option: E
Explanation:

This option is correct match of all metal ions with their complexes.

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

Show answer
Correct Option: A
Explanation:

EDTA is hexadentate, DMG is bidentate, pyridine is unidentate, terpyridine is tridentate and corrole is tetradentate, are all correctly matched in this option.

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