First slide

Transition elements

Question

Select the incorrect statement:

Moderate

A

The atomic radii of 4d series are larger than those of 3d series
B

The atomic radii of 4d and 5d series are almost same.
C

Stability of the M³⁺ ions in aqueous solution is:
Sc³⁺ >cr³⁺>Fe³⁺>Co³⁺
D

Basic strength of the hydroxides is:
$La (OH)_{3} < Y (OH)_{3} < Sc (OH)_{3}$

Solution

Correct (a) $La (OH)_{3} > Y (OH)_{3} > Sc (OH)_{3}$
Size of La³⁺ > Y³⁺ > Sc³⁺
According to Fajan's rule: Large cation & small anion, more ionic character and more basic. Hence the basic strength order is:
La(OH)₃ > Y(OH)₃, Sc(OH)₃

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