Question

Assertion (A): The spin only magnetic moment of $ S{{c}^{3+}} $ is 1.73 BM. Reason (R): The spin only magnetic moment (in BM) of an ion is equal to $ \sqrt{n(n+2)}, $ where $ n $ is the number of unpaired electrons present in the ion. The correct answer is:

• A. both (A) and (R) are true and (R) is the correct explanation of
• B. both (A) and (R) are true and (R) is not the correct explanation of
• C. (A) is true but (R) is not true
• D. (A) is not true but (R) is true

Answer 1

Answer: (D)

$ _{21}S{{c}^{3+}}=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}} $ Number of unpaired electrons $ (n)=0 $ Hence, spin only magnetic moment i.e., $ \mu =\sqrt{n(n+2)} $ = 0