Identify the metal that froms colourless compounds.

Options

A. Iron (Z=26)
B. Chromium (Z=24)
C. Vanadium (Z=23)
D. Scandium (Z=21)

Answer

D

Explanation

Out of given options iron, chromium and vanadium are form coloured compounds because their ions contain unpaired `e^(-)` in 'd' subshell.
`Fe^(2+), Fe^(3+)(5), Cr^(3+)(3), V^(3+)(2)` but `Sc^(3+) (0)`.