Which of the following ions is colourless in solution?

V^{3 +}

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{C r}^{3 +}

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{C o}^{2 +}

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{S c}^{3 +}

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Solution

The correct option is D ${S c}^{3 +}$
$V (23) = [A r] 3 d^{3}, 4 s^{2}$
$V^{3 +} = [A r] 3 d^{2}, 4 s^{0}$ (two unpaired electrons)
$C r (24) = [A r] 3 d^{5}, 4 s^{1}$
${C r}^{3 +} = [A r] 3 d^{3}, 4 s^{0}$ (three unpaired electrons)
$C o (27) = [A r] 3 d^{7}, 4 s^{2}$
${C o}^{2 +} = [A r] 3 d^{7}, 4 s^{0}$ (three unpaired electrons)
$S c (21) = [A r] 3 d^{7}, 4 s^{2}$
${S c}^{3 +} = [A r] 3 d^{0}, 4 s^{0}$ (no unpaired electrons)
Thus, in ${S c}^{3 +}$ no unpaired d-electron is present.
Hence, no d-d transition is possible and it is colourless ion.

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Question 14

The pair of ions having same electronic configuration is.............

(a) $C r^{3 +}, F e^{3 +}$ (b) $F e^{3 +}, M n^{2 +} +$ (c) $F e^{3 +}, C o^{3 +}$ (d) $S C^{3 +}, C r^{3 +}$

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