Exams › NEET › Chemistry

Which of the following ions has the highest spin magnetic moment?

1. Co3+ = [Ar] 3d6, unpaired e−(n) = 4
2. Cr3+ = [Ar] 3d3, unpaired e−(n) = 3
3. Fe3+ = [Ar] 3d5, unpaired e−(n) = 5
4. Ni2+ = [Ar] 3d8, unpaired e−(n) = 2

Correct answer: Fe3+ = [Ar] 3d5, unpaired e−(n) = 5

Solution

The spin magnetic moment is calculated using the formula μ = √n(n+2), where n is the number of unpaired electrons. Fe3+ has 5 unpaired electrons, giving the highest spin magnetic moment among the options.

Related NEET Chemistry questions

• Identify the incorrect statement.
• Which one of the following ions exhibits d-d transition and paramagnetism as well?
• Magnetic moment 2.84 B.M. is given by: (At. nos, Ni = 28, Ti = 22, Cr = 24, Co = 27)
• Magnetic moment 2.83 B.M is given by which of the following ions? (At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)
• KMnO4 can be prepared from K2MnO4 as per the reaction: 3MnO4^2− + 2H2O → 2MnO4^− + MnO2 + 4OH^−. The reaction can go to completion by removing OH^− ions by adding:
• Which of the statements is not true?

⚔️ Practice NEET Chemistry free + battle 1v1 →