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Question

Across the lanthanide series, the basicity of the lanthanide hydroxides?

A
Increases
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B
Decreases
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C
First increase and then decrease
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D
First decrease and then increase
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Solution

The correct option is C Decreases
Across the lanthanide series the size of the cations decreases thereby decreasing ionic character and increasing covalent character of hydroxides of lanthanides. Thus, the basicity of hydroxides decreases.

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