Which of the following statements is incorrect ?

Options

A. Lanthanide do not exhibit magnetic properties and also color and spectral properties.
B. Because of same charge, almost identical radii and similar chemical properties, lanthanide ions `(Ln^(3+))` can't be separated easily form one another.
C. The second and third rows of transition elements (Y `rarr` Ag and La `rarr` Lu) resemble each other more closely than do the elements of the first and second rows (Sc `rarr` Cu and Y `rarr` Ag)
D. The vertical pair of elements of second and third transition serious, such as Zn/Hf, Nb/Ta and Mo/W, are almost identical in size.

Answer

A

Explanation

Many traivalent lanthanoid ions are colored both in the solid state and in aqueous solutions. Color of these ions are usually attributed to the f-f transitions. Neither `La^(3+)` not `Lu^(3+)` ion shows any color but the rest do so. The lanthanoid ions other than the `f^(0)` type `(La^(3+)` and `Ce^(4+))` and the `f^(14)` type `(Yb^(2+)` and `Lu^(3+))` are all paramagnetic.