Most basic hydroxide among the following is

Question

Most basic hydroxide among the following is (A)  Lu(OH)3  (B)  Eu(OH)3  (C)  Yb(OH)3  (D)  Ce(OH)3

Tardigrade Admin · Accepted Answer

Due to lanthanide contraction, the size of

M^{3 +}

ions

[i e, L u^{3 +}, E u^{3 +}, Y b^{3 +}

and

C e^{3 +}]

decreases and thus, the basic strength of their hydroxides decreases.

The order of size of given

M^{3 +}

ions is

C e^{3 +} > E u^{3 +} > Y b^{3 +} > L u^{3 +}

∴

The order of basic strength of hydroxides is

(most basic) < b r / >< b r / > C e (O H)_{3} > E u (O H)_{3} > Yb (O H)_{3} > Lu (O H)_{3}

Q. Most basic hydroxide among the following is