Q.

Metal hydroxides are basic in nature.Which one of the following  metal hydroxide is the weakest base

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a

CeOH3

b

PrOH3

c

LaOH3

d

NdOH3

answer is D.

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Detailed Solution

Ce(Z=58) ;Pr(Z=59); Nd(Z=60) ; Sm(Z=62) ;Eu(Z=63); Gd(Z=64); Yb(Z=70) ; Lu(Z=71)Size ..............La+3>Ce+3>Pr+3>Nd+3>Sm+3>Eu+3>Gd+3>Yb+3>Lu+3 Basic strength..LaOH3>CeOH3>PrOH3>NdOH3>SmOH3>EuOH3>GdOH3>YbOH3>LuOH3
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