Question: Which of the following complexes is expected to be diamagnetic?
Options:
[Fe(H2O)6]3+
[Cu(NH3)4]2+
[Co(NH3)6]3+
[Ni(CO)4]
Correct Answer: [Ni(CO)4]
Solution:
[Ni(CO)4] is diamagnetic because all electrons are paired in the presence of the strong field ligand CO.
Which of the following complexes is expected to be diamagnetic?
Practice Questions
Q1
Which of the following complexes is expected to be diamagnetic?
[Fe(H2O)6]3+
[Cu(NH3)4]2+
[Co(NH3)6]3+
[Ni(CO)4]
Questions & Step-by-Step Solutions
Which of the following complexes is expected to be diamagnetic?
Step 1: Understand what diamagnetic means. A substance is diamagnetic if all its electrons are paired, which means it does not have any unpaired electrons.
Step 2: Identify the complex in question, which is [Ni(CO)4].
Step 3: Recognize that CO (carbon monoxide) is a strong field ligand. Strong field ligands cause electrons to pair up in the lower energy orbitals.
Step 4: Determine the electron configuration of nickel (Ni), which is [Ar] 3d8 4s2.
Step 5: When nickel forms the complex [Ni(CO)4], it loses 2 electrons from the 4s orbital and 2 from the 3d orbital, resulting in a 3d10 configuration.
Step 6: Check the electron pairing in the 3d orbitals. Since all 10 electrons in the 3d orbitals are paired, the complex is diamagnetic.
Step 7: Conclude that [Ni(CO)4] is diamagnetic because all electrons are paired due to the influence of the strong field ligand CO.
No concepts available.
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