Question:
Identify a weakest base from following
Identify a weakest base from following
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Among lanthanide hydroxides, \(\text{La(OH)}_3\) is most basic and \(\text{Lu(OH)}_3\) is least basic.
Updated On: May 14, 2026
- \(\text{Eu(OH)}_3\)
- \(\text{La(OH)}_3\)
- \(\text{Lu(OH)}_3\)
- \(\text{Gd(OH)}_3\)
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The Correct Option is C
Solution and Explanation
Concept:
In lanthanides, due to lanthanide contraction, ionic size decreases from La to Lu. As size decreases, covalent character increases and basic strength of hydroxides decreases.
Step 1: Recall the trend of lanthanide hydroxides.
Basic strength decreases from: \[ \text{La(OH)}_3 \to \text{Lu(OH)}_3 \]
Step 2: Identify the weakest base.
Since basicity decreases across the series, the weakest base is: \[ \text{Lu(OH)}_3 \] Hence, the correct answer is:
\[ \boxed{(C)\ \text{Lu(OH)}_3} \]
In lanthanides, due to lanthanide contraction, ionic size decreases from La to Lu. As size decreases, covalent character increases and basic strength of hydroxides decreases.
Step 1: Recall the trend of lanthanide hydroxides.
Basic strength decreases from: \[ \text{La(OH)}_3 \to \text{Lu(OH)}_3 \]
Step 2: Identify the weakest base.
Since basicity decreases across the series, the weakest base is: \[ \text{Lu(OH)}_3 \] Hence, the correct answer is:
\[ \boxed{(C)\ \text{Lu(OH)}_3} \]
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