Transition Elements and Coordination Chemistry Basics - Numerical Applications
Q. What is the coordination number of the complex [Co(NH3)6]Cl3?
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Solution
The coordination number is determined by the number of ligand donor atoms bonded to the central metal ion. In [Co(NH3)6]Cl3, there are six ammonia ligands, giving a coordination number of 6.
Correct Answer: B — 6
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Q. What is the formula for the complex formed when iron(III) ions react with thiocyanate ions?
A.
[Fe(SCN)3]
B.
[Fe(SCN)2]
C.
[Fe(SCN)6]3+
D.
[Fe(SCN)4]2+
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Solution
The complex formed is [Fe(SCN)3], where iron(III) ions coordinate with thiocyanate ions.
Correct Answer: A — [Fe(SCN)3]
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Q. What is the hybridization of the central metal ion in the complex [Ni(CO)4]?
A.
sp
B.
sp2
C.
sp3
D.
d2sp3
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Solution
In [Ni(CO)4], nickel is in the +0 oxidation state and uses sp3 hybridization to form four equivalent bonds with the CO ligands.
Correct Answer: C — sp3
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Q. What is the primary factor that determines the color of transition metal complexes?
A.
The oxidation state of the metal
B.
The type of ligands
C.
The coordination number
D.
The size of the metal ion
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Solution
The type of ligands affects the splitting of d-orbitals, which in turn influences the color of the transition metal complex.
Correct Answer: B — The type of ligands
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Q. Which of the following is a strong field ligand?
A.
I-
B.
Cl-
C.
CN-
D.
H2O
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Solution
CN- (cyanide) is a strong field ligand that causes large splitting of d-orbitals in transition metal complexes.
Correct Answer: C — CN-
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Q. Which transition metal is known for forming a variety of oxidation states and colored compounds?
A.
Zinc
B.
Copper
C.
Scandium
D.
Titanium
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Solution
Copper is known for its ability to form various oxidation states (e.g., +1 and +2) and colored compounds, such as blue copper(II) sulfate.
Correct Answer: B — Copper
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