D-And F-Block Elements Ques 444
Question: Across the lanthanide series, the basicity of the lanthanoid hydroxides
Options:
A) increases
B) decreases
C) first increases and then decreases
D) does not change
Show Answer
Answer:
Correct Answer: B
Solution:
Across lanthanoid series basicity of lanthanoid hydroxides decreses. The basicity decreses form $ Ce{{(OH)}_3} $ to $ Lu{{(OH)}_3} $ . 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.
