Q. $\left\lbrack Sc\left( H_{2}O \right)_{6} \right\rbrack^{3 +}$ ion is
A) Colourless and diamagnetic
B) Coloured and octahedral
C) Colourless and paramagnetic
D) Coloured and paramagnetic
Explanation
(a)
_{21}Sc=[Ar]$3d^{1}4s^{2}$
$Sc^{3 +} = \lbrack Ar\rbrack 3d^{0}4s^{0}$no unpaired electrons in $d$-subshell, so it is diamagnetic and colourless.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.