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

Increases

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Decreases

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First increase and then decrease

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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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