Question: Which of the following complexes is paramagnetic? (2023) 2023
Options:
[Ni(CN)4]2-
[Fe(H2O)6]3+
[Cu(NH3)4]2+
[Zn(NH3)4]2+
Correct Answer: [Fe(H2O)6]3+
Exam Year: 2023
Solution:
[Fe(H2O)6]3+ has unpaired electrons, making it paramagnetic, while the others have all paired electrons.
Which of the following complexes is paramagnetic? (2023) 2023
Practice Questions
Q1
Which of the following complexes is paramagnetic? (2023) 2023
[Ni(CN)4]2-
[Fe(H2O)6]3+
[Cu(NH3)4]2+
[Zn(NH3)4]2+
Questions & Step-by-Step Solutions
Which of the following complexes is paramagnetic? (2023) 2023
Step 1: Understand what paramagnetic means. Paramagnetic substances have unpaired electrons, which make them attracted to a magnetic field.
Step 2: Identify the complexes given in the question. In this case, we are looking at [Fe(H2O)6]3+ and possibly other complexes.
Step 3: Determine the electron configuration of the central metal ion in the complex. For [Fe(H2O)6]3+, the iron ion (Fe) is in the +3 oxidation state.
Step 4: Find the electron configuration of Fe3+. Iron (Fe) has an atomic number of 26. The electron configuration for neutral Fe is [Ar] 4s2 3d6. When it loses 3 electrons to become Fe3+, it loses the 4s electrons first and then one 3d electron, resulting in [Ar] 3d5.
Step 5: Analyze the 3d5 configuration. In the 3d subshell, there are 5 electrons, and they can be arranged in such a way that there are unpaired electrons. This means that [Fe(H2O)6]3+ has unpaired electrons.
Step 6: Compare with other complexes. If the other complexes have all paired electrons in their electron configurations, they will be diamagnetic and not paramagnetic.
Step 7: Conclude that [Fe(H2O)6]3+ is the paramagnetic complex because it has unpaired electrons.
No concepts available.
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