NEET Chemistry Coordination Compounds MCQs Set A

Question:  CFSE(Δ₀) for metal ion in d⁷ configuration in presence of strong ligand field is

• a) –0.6 Δ₀
• b) –0.8 Δ₀
• c) –1.6 Δ₀
• d) –1.8 Δ₀

Answer: –1.8 Δ₀

Question:  Which octahedral coordination compound will show maximum conductivity in aqueous solution if all NH₃ act as ligands?

• a) CoCl₃.6NH₃ 
• b) CoCl₃.5NH₃
• c) CoCl₃.4NH₃   
• d) All will have same conductivity as every compound has got 3Cl

Answer: CoCl₃.6NH₃ 

Question: In case of high spin situation

• a) Δ₀= P 
• b) Δ₀> P
• c) Δ₀< P 
• d) Δ₀.P = 1

Answer:  Δ₀< P 

Question: The name of complex ion, [Fe(CN)₆]^3– is 

• a) Tricyanoferrate (III) ion
• b) Hexacyanidoferrate (III) ion
• c) Hexacyanoiron (III) ion
• d) Hexacyanitoferrate (III) ion

Answer: Hexacyanidoferrate (III) ion

Question: Which is a diamagnetic complex?

• a) [Fe(H₂O)₆]³⁺ 
• b) [Fe(H₂O)₆]²⁺
• c) [Fe(CN)₆]3– 
• d) [Fe(CN)₆]^4–

Answer:  [Fe(CN)₆]^4–

Question:  Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be (en = ethylenediamine) 

• a) 3
• b) 4
• c) 2
• d) 1

Answer: 3

Question: The hybridization involved in complex [Ni(CN)₄]^2– is (At. No. Ni = 28)

• a) d²sp²
• b) d²sp³
• c) dsp² 
• d) sp³

Answer: dsp² 

Question: The sum of coordination number and oxidation number of the metal M in the complex [M(en)₂(C₂O₄)]Cl (where en is ethylenediamine) is 

• a) 7
• b) 8
• c) 9
• d) 6

Answer: 9

Question: Magnetic moment 2.84 B.M. is given by (At. nos, Ni = 28, Ti = 22, Cr = 24, Co = 27)

• a) Co²⁺
• b) Ni²⁺
• c) Ti³⁺
• d) Cr²⁺

Answer:  Ni²⁺

Question:  Cobalt(III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C? 

• a) CoCl₃.6NH₃
• b) CoCl₃.3NH₃
• c) CoCl₃.4NH₃ 
• d) CoCl₃.5NH₃

Answer:  CoCl₃.3NH₃

More Questions.......................................................

Question: A magnetic moment of 1.73 BM will be shown by one among the following

• a) [Ni(CN)₄]^2–  
• b) TiCl₄
• c) [CoCl₆]^4– 
• d) [Cu(NH₃)₄]²⁺

Answer:  [Cu(NH₃)₄]²⁺

Question:  Which of these statements about [Co(CN)₆]^3– is true? 

• a) [Co(CN)₆]^3– has no unpaired electrons and will be in a high-spin configuration
• b) [Co(CN)₆]^3– has no unpaired electrons and will be in a low-spin configuration
• c) [Co(CN)₆]^3–  has four unpaired electrons and will be in a low-spin configuration
• d) [Co(CN)₆]^3– has four unpaired electrons and will be in a high-spin configuration

Answer:  [Co(CN)₆]^3– has no unpaired electrons and will be in a low-spin configuration

Question: Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is

• a) [Mn(H₂O)₆]³⁺
• b) [Fe(H₂O)₆]³⁺
• c) [Co(H₂O)₆]²⁺ 
• d) [Co(H₂O)₆]³⁺

Answer: [Fe(H₂O)₆]³⁺

Question: Which of the following complexes is used to be as an anticancer agent?

• a) mer - [Co(NH₃)₃Cl₃] 
• b) cis - [PtCl₂(NH₃)₂]
• c) cis - K₂[PtCl₂Br₂]
• d) Na₂CoCl₄

Answer:  cis - [PtCl₂(NH₃)₂]

Question:  An excess of AgNO₃ is added to 100mL of a 0.01M solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl precipitated would be 

• a) 0.002
• b) 0.003
• c) 0.01
• d) 0.001

Answer: 0.001

Question: Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of thefollowing statements is not true ?

• a) Red complex has a square planar geometry
• b) Complex has symmetrical H-bonding
• c) Red complex has a tetrahedral geometry
• d) Dimethylglyoxime functions as bidentate ligand

Answer: Red complex has a tetrahedral geometry

Question: Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour ?

• a) [Cr(NH₃)₆]³⁺
• b) [Co(NH₃)₆]³⁺
• c) [Ni(NH₃)₆]²⁺ 
• d) [Zn(NH₃)₆]²⁺

Answer:  [Ni(NH₃)₆]²⁺ 

Question:  The complex, [Pt (Py) (NH₃) Br Cl] will have how many geometrical isomers? 

• a) 2
• b) 3
• c) 4
• d) 0

Answer: 3

Question:  Low spin complex of d⁶–cation in an octahedal field will have the following energy (Δ_o= crystal field splitting energy in an octahedral field, P = electron pairing energy)

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  The complexes [Co(NH₃)₆][Cr (CN)₆] and [Cr (NH₃)₆] [Co(CN)₆] are the examples of which type of isomerism?

• a) Geometrical isomerism
• b) Linkage isomerism
• c) Ionization isomerism
• d) Coordination isomerism

Answer: Coordination isomerism

Question:  The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

• a) [Cr (H₂O)₆]²⁺
• b) [Mn (H₂O)₆]²⁺
• c) [Fe (H₂O)₆]²⁺
• d) [Co(H₂O)₆]²⁺

Answer:  [Co(H₂O)₆]²⁺

Question: Of the following complex ions, which is diamagnetic in nature?

• a) [Co F₆]^3–
• b) [Ni Cl₄]^2–
• c) [Ni (CN)₄]^2–
• d) [Cu Cl₄]^2–

Answer:  [Ni (CN)₄]^2–

Question:  Which of the following carbonyls will have the strongest C – O bond ? 

• a) V(CO)₆^– 
• b) Fe(CO)₅
• c) Mn(CO)₆⁺ 
• d) Cr(CO)₆

Answer:  Mn(CO)₆⁺ 

Question: Which of the following complex compounds will exhibit highest paramagnetic behaviour ? (At. no. Ti = 22, Cr = 24,Co = 27, Zn = 30)

• a) [Co(NH₃)₆]³⁺ 
• b) [Zn(NH₃)₆]²⁺
• c) [Ti(NH₃)₆]³⁺
• d) [Cr(NH₃)6]³⁺

Answer: [Cr(NH₃)6]³⁺

Question:  Crystal field stabilization energy for high spin d⁴ octahedral complex is 

• a) –1.8 Δ₀
• b) –1.6 Δ₀+P  
• c) –1.2 Δ₀
• d) –0.6 Δ₀ 

Answer: –0.6 Δ₀ 

Question: The existence of two different coloured complexes with the composition of [Co(NH₃)₄Cl₂] ⁺ is due to

• a) Linkage isomerism
• b) Geometrical isomerism
• c) Coordination isomerism
• d) Ionization isomerism

Answer: Geometrical isomerism

Question: Which of the following complex ion is not expected to absorb visible light ?

• a) [Ni(CN)₄]^2–
• b) [Cr(NH₃)₆]⁺³
• c) [Fe(H₂O)₆]²⁺
• d) [Ni(H₂O)₆]²⁺

Answer:  [Ni(CN)₄]^2–

Question: Which one of the following complexes is not expected to exhibit isomerism ?

• a) [Ni(NH₃)₄(H₂O)₂]²⁺
• b) [Pt (NH₃)₂Cl₂]
• c) [Ni (NH₃)₂Cl₂] 
• d) [Ni(en)₃]²⁺

Answer:  [Ni (NH₃)₂Cl₂] 

Question: Which of the following does not show optical isomeism ?

• a) [Co(NH₃)₃Cl₃]⁰ 
• b) [Co(en)Cl₂(NH₃)₂]⁺
• c) [Co(en)₃]³⁺  
• d) [Co(en)₂Cl₂]⁺ (en=ethylenediamine)

Answer: [Co(NH₃)₃Cl₃]⁰ 

Question: Which of the following complex ions is expected to absorb visible light ? (At. No. Zn=30, SC=21, Ti = 22, Cr = 24)

• a) [Ti(en)₂(NH₃)₂]⁴⁺ 
• b) [Cr(NH₃)₆]³⁺
• c) [Zn(NH₃)₆]²⁺
• d) [Sc(H₂O)₃(NH₃)₃]³⁺

Answer:  [Cr(NH₃)₆]³⁺