A) increases
B) decreases
C) first increases and then decreases
D) first decreases and then increases
E) does not change
Correct Answer: B
Solution :
Across the lanthanide series, the basicity of the lanthanide hydroxides decreases because across the lanthanide series, due to lanthanide contraction, size of cations decreases. Which results incensement in covalent character and decreasement in ionic character. So, the basicity of hydroxides decreases.
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