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)
In $\left\lbrack Sc\left( H_{2}O \right)_{6} \right\rbrack^{3 +},$
Oxidation state of Sc is +3.
Sc (ground state)
3d 4s 4p
[table] $\upharpoonleft$ | | | | | | $⥮$ | | | | [/table]
$Sc^{3 +}$
[table] | | | | | | | | | | [/table]
$\because Sc^{3 +}$ has no unpaired electron.
$\therefore\left\lbrack Sc\left( H_{2}O \right)_{6} \right\rbrack^{3 +}$ is diamagnetic and colourless.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.