Which one of the following forms a colourless solution in an aqueous medium?

[Atomic number $S c = 21, T i = 22, V = 23, C r = 24$ ]

V^{3 +}

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{C r}^{3 +}

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{T i}^{3 +}

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{S c}^{3 +}

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Solution

The correct option is D ${S c}^{3 +}$
The electronic configuration of $S c$ is:
$1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2}, 3 p^{6}, 3 d^{1}, 4 s^{2}$

Electronic 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.

Hence, option $D$ is correct.

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Similar questions

Which one of the following ions is the most stable in aqueous solution?
(Atomic number. Ti = 22, V = 23, Cr = 24, Mn = 25)

S c^{3 +}

{T i}^{3 +}

S c = 21, T i = 22

3 d

+ 1

S c^{3 +}, V^{3 +}, T i^{4 +}, M n^{2 +}

S c = 21, V = 23, T i = 22, M n = 25

3 d

T i^{4 +}, V^{2 +}, M n^{3 +}, C r^{3 +}

T i = 22, V = 23, M n = 25, C r = 24)

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