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

Question

Which one of the following forms a colourless solution in aqueous medium? (Atomic number Sc=21, Ti=22, V=23, Cr=24) (A)  V3+ (B) Cr3+ (C) Ti3+ (D) Sc3+

Tardigrade Admin · Accepted Answer

The electronic configuration of Sc is 1 s2, 2 s2 2 p6, 3 s2 3 p6 3 d1, 4 s2 and configuration of Sc 3+ is 1 s2, 2 s2 2 p6, 3 s2 3 p6 So SC3+ is colourless due to the absence of unpaired electrons in d-orbital.

Q. Which one of the following forms a colourless solution in aqueous medium? (Atomic number $S c = 21, T i = 22, V = 23, C r = 24$ )

$V^{3 +}$

$C r^{3 +}$

$T i^{3 +}$

$S c^{3 +}$

The electronic configuration of $S c$ 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 $S c^{3 +}$ is
$1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}$
So $S C^{3 +}$ is colourless due to the absence of unpaired electrons in d-orbital.

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

V3+

Cr3+

Ti3+

Sc3+