Q.

Across the lanthanide series, the basicity of the lanthanide hydroxides

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a

first decreases and then increases

b

decreases

c

increases

d

first increases and then decreases

answer is B.

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Detailed Solution

The basicity decreases from CeOH3 to LuOH3. Due to lanthanide contraction, the decrease in the size of the cation increases the covalent character between the lanthanide ion and hydroxide ion thereby, reducing the basic character of the lanthanide hydroxide.
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