Question

# Which of the following is the strongest base ?

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

Solution

## The correct option is C $$La(OH)_{3}$$For the Lanthanides, the basicity series is the following:$$La^{3+} > Ce^{3+} > Pr^{3+} > Nd^{3+} > Pm^{3+} > Sm^{3+} > Eu^{3+} > Gd^{3+} > Tb^{3+} > Dy^{3+}$$$$> Ho^{3+} > Er^{3+} > Tm^{3+} > Yb^{3+} > Lu^{3+}$$In other words, the basicity decreases as the atomic number increases.Chemistry

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