Q. Which of the following statements is true about coordination compounds?
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A.
They always have a positive charge
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B.
They can exhibit color
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C.
They cannot form complexes
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D.
They are always soluble in water
Solution
Coordination compounds can exhibit color due to d-d transitions and are not limited to having a positive charge.
Correct Answer: B — They can exhibit color
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Q. Which of the following statements is true about the complex ion [Co(NH3)6]3+?
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A.
It is paramagnetic
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B.
It is diamagnetic
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C.
It has a coordination number of 4
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D.
It contains a transition metal
Solution
Cobalt is a transition metal, and the complex has a coordination number of 6.
Correct Answer: D — It contains a transition metal
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Q. Which of the following statements is true about the complex [Cr(NH3)6]3+?
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A.
It is tetrahedral
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B.
It is octahedral
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C.
It is square planar
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D.
It is linear
Solution
[Cr(NH3)6]3+ has an octahedral geometry due to the six ligands surrounding the chromium ion.
Correct Answer: B — It is octahedral
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Q. Which of the following statements is true about the complex [Fe(CN)6]3-?
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A.
It is paramagnetic
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B.
It is diamagnetic
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C.
It has a coordination number of 4
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D.
It contains only monodentate ligands
Solution
[Fe(CN)6]3- is diamagnetic because all the electrons are paired in the d-orbitals of Fe in the +3 oxidation state.
Correct Answer: B — It is diamagnetic
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Q. Which of the following statements is true regarding coordination compounds?
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A.
They always have a fixed oxidation state.
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B.
They can exhibit different colors.
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C.
They cannot form isomers.
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D.
They are always soluble in water.
Solution
Coordination compounds can exhibit different colors due to the presence of different ligands and their ability to split d-orbitals.
Correct Answer: B — They can exhibit different colors.
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Q. Which of the following statements is true regarding the complex ion [Fe(CN)6]3-?
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A.
It is a high-spin complex
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B.
It is a low-spin complex
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C.
It has a coordination number of 4
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D.
It is paramagnetic
Solution
[Fe(CN)6]3- is a low-spin complex due to the strong field ligand CN-, which causes pairing of electrons.
Correct Answer: B — It is a low-spin complex
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Q. Which of the following statements is true regarding the complex [Co(NH3)6]3+?
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A.
It is tetrahedral
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B.
It is octahedral
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C.
It is square planar
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D.
It has no unpaired electrons
Solution
[Co(NH3)6]3+ is octahedral in geometry due to the six ligands surrounding the cobalt ion.
Correct Answer: B — It is octahedral
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Q. Which of the following statements is true regarding the complex [Cu(NH3)4]SO4?
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A.
Cu is in +1 oxidation state
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B.
Cu is in +2 oxidation state
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C.
NH3 is a monodentate ligand
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D.
All of the above
Solution
In [Cu(NH3)4]SO4, copper is in +2 oxidation state, NH3 is a monodentate ligand, making the statement 'All of the above' incorrect.
Correct Answer: D — All of the above
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