1. Tardigrade
  2. Question
  3. Chemistry
  4. Which one of the following forms a colourless solution in aqueous medium? (Atomic number Sc=21, Ti=22, V=23, Cr=24)

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Which one of the following forms a colourless solution in aqueous medium? (Atomic number $Sc=21,\, Ti=22,\,V=23,\,Cr=24$)

Bihar CECEBihar CECE 2012The d-and f-Block Elements

Solution:

The electronic configuration of $Sc$ is
$1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6} 3 d^{1},\, 4 s^{2}$
and configuration of $Sc ^{3+}$ is
$1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6}$
So $SC^{3+}$ is colourless due to the absence of unpaired electrons in d-orbital.