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12th Grade > Chemistry

COORDINATION COMPOUNDS MCQs

Total Questions : 29 | Page 1 of 3 pages
Question 1. A compound absorbing violet colour from sunlight will be
  1.    yellow
  2.    Green 
  3.    orange
  4.    violet
 Discuss Question
Answer: Option A. -> yellow
:
A
The colour of the complex is complimentary to that which it absorbs.
Question 2. The ions present in the aqueous solution of potash alum are
  1.    only K+ and Al3+
  2.    only K+ and SO2−4
  3.    only Al3+ and  SO2−4
  4.    All K+,Al3+ and SO2−4
 Discuss Question
Answer: Option D. -> All K+,Al3+ and SO2−4
:
D
Potash alum is K2SO4.Al2(SO4)3.24H2O
Question 3. In a high spin octahedral complex, the d7 configuration according to CFT is
  1.    t62g,e1g
  2.    t42g,e3g
  3.    t32g,e4g
  4.    t52g,e2g
 Discuss Question
Answer: Option D. -> t52g,e2g
:
D
High spin complex means ligand is weak, hence, Δ0 < P (pairing energy)
Question 4. Which one of the following is likely to show optical activity?
  1.    Trans−[Co(NH3)4Cl2]+  
  2.    [Co(H2O)Cl]2+
  3.    Cis−[Co(NH3)2(en)2]3+
  4.    Trans−[Co(NH3)2(en)2]3+
 Discuss Question
Answer: Option C. -> Cis−[Co(NH3)2(en)2]3+
:
C
Only Cis-octahedral complexes show optical activity.
Question 5. In Fe(CO)5, the Fe - C bond possesses
  1.    π character only
  2.    Both σ and π character
  3.    σ character only
  4.    Cannot be predicted
 Discuss Question
Answer: Option B. -> Both σ and π character
:
B
There is dπρπ metal to ligand back bonding in Fe - C bond of Fe(CO)5. So, it possesses both σ and π character.
Question 6. Which one of the following has an optical isomer?
  1.    [Zn(en)2]2+
  2.    [Zn(en)(NH3)2]2+
  3.    [Co(en)3]3+
  4.    [Co(H2O)4(en)]3+
 Discuss Question
Answer: Option C. -> [Co(en)3]3+
:
C
[Co(en)3]3+ does not have plane of symmetry.
Question 7. The metal ion present in Zeise's salt is
  1.    Magnesium
  2.    Iron
  3.    Platinum
  4.    Palladium
 Discuss Question
Answer: Option C. -> Platinum
:
C
Zeise’s salt is K[PtCl3(C2H4)]
Question 8. An aqueous solution containing ferrous cyanide and potassium cyanide in the molar ratio of 1 : 4 is evaporated. The solid obtained is re-dissolved in water. The ion present in this solution is
  1.    [Fe(CN)6]4−        
  2.    [Fe(CN)6]3−
  3.    [Fe(CN)3]
  4.    Fe3+
 Discuss Question
Answer: Option A. -> [Fe(CN)6]4−        
:
A
The solid obtained is
FeSO4+KCNK4[Fe(CN)6]4K++[Fe(CN)6]4
Question 9. How many EDTA molecules are required to make an octahedral complex with a Ca2+ ion?
  1.    3
  2.    1
  3.    2
  4.    6
 Discuss Question
Answer: Option B. -> 1
:
B
EDTA is a hexadentate ligand and therefore only one EDTA molecule is required to form octahedral complex.
Question 10. Which of the following does not show optical isomerism?
  1.    [Co(NH3)3Cl3]
  2.    [Co(en)Cl2(NH3)2]+1
  3.    [Co(en)3]3+
  4.    [Co(en)2Cl2]+
 Discuss Question
Answer: Option A. -> [Co(NH3)3Cl3]
:
A
Complexes of the type MA3B3do not show optical isomerism but they show mer-fac isomerism.

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