Coordination Compounds(12th Grade > Chemistry ) Questions and Answers
Question 1.A compound absorbing violet colour from sunlight will be
yellow
Green
orange
violet
Explanation:-
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
only K+ and Al3+
only K+ and SO2−4
only Al3+ and SO2−4
All K+,Al3+ and SO2−4
Explanation:-
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
t62g,e1g
t42g,e3g
t32g,e4g
t52g,e2g
Explanation:-
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?
Trans−[Co(NH3)4Cl2]+
[Co(H2O)Cl]2+
Cis−[Co(NH3)2(en)2]3+
Trans−[Co(NH3)2(en)2]3+
Explanation:-
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
π character only
Both σ and π character
σ character only
Cannot be predicted
Explanation:-
Answer: Option B. -> Both σ and π character : B There is dπ−ρπ 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?
[Zn(en)2]2+
[Zn(en)(NH3)2]2+
[Co(en)3]3+
[Co(H2O)4(en)]3+
Explanation:-
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
Magnesium
Iron
Platinum
Palladium
Explanation:-
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
[Fe(CN)6]4−
[Fe(CN)6]3−
[Fe(CN)3]
Fe3+
Explanation:-
Answer: Option A. -> [Fe(CN)6]4− : A The solid obtained is FeSO4+KCN→K4[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?
3
1
2
6
Explanation:-
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?
[Co(NH3)3Cl3]
[Co(en)Cl2(NH3)2]+1
[Co(en)3]3+
[Co(en)2Cl2]+
Explanation:-
Answer: Option A. -> [Co(NH3)3Cl3] : A Complexes of the type MA3B3do not show optical isomerism but they show mer-fac isomerism.