Question

Statement 1: The spin only magnetic moment of $Sc^{3+}$ is $1.73 B.M.$
Statement 2: The spin only magnetic moment of an ion is equal to $\sqrt{n\left(n+2\right)}$ where n is the number of unpaired electrons in the ion.

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation o f the statement 1.
• B. If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation o f the statement 1.
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true

Answer 1

Answer: (D)

Statement 1: False; $Sc^{3+}$ ion has no unpaired electron $\left(3d^{0}4s^{0}\right)$ and thus has zero magnetic moment.
Statement 2: Magnetic moment is due to ‘spin only’ = $\sqrt{n\left(n+2\right)}$ value, n is number of unpaired electron(s).