Question

Consider the following statements with respect to lanthanides:

1. The basic strength of hydroxides of lanthanides increases from $La(OH{)}_3$ to $Lu(OH{)}_3.$

2. The lanthanide ions $L{u}^{3+},Y{b}^{2+}andC{e}^{4+}$ are diamagnetic.

Which of the statement(s) given above is/are correct?

• A. 1 only
• B. 2 only
• C. Both 1 and 2
• D. Neither 1 nor 2

Answer 1

Answer: (C)

Both 1 and 2

(1) The base strength of hydroxides of lanthanides increases from ${La\left(OH\right)}_3$ to ${Lu\left(OH\right)}_3$.

(2) The lanthanide ions ${Lu}^{3+},{Yb}^{2+},{Ce}^{4+}$ are deficient of unpaired electron hence, these are diamagnetic in nature.