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Question

Which of the following is the strongest base ?


A
Sm(OH)3
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B
La(OH)3
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C
Lu(OH)3
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D
Yb(OH)3
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Solution

The correct option is C La(OH)3
For the Lanthanides, the basicity series is the following:

La3+>Ce3+>Pr3+>Nd3+>Pm3+>Sm3+>Eu3+>Gd3+>Tb3+>Dy3+

>Ho3+>Er3+>Tm3+>Yb3+>Lu3+

In other words, the basicity decreases as the atomic number increases.


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