JEE Main · ChemistryEasy

$Which of the following ions is colorless in aqueous solution?$

A. $Sc^{3 +}$
B. $Ti^{3 +}$
C. $V^{3 +}$
D. $Cr^{3 +}$

Show correct answer & step-by-step solution

Correct answer: A — $Sc^{3 +}$

Solution

$Color in transition metal ions arises from d-d electronic transitions.$
$The electronic configuration of Sc^{3 +} is [Ar] 3 d^{0} .$
$Since there are no d-electrons, no d-d transition is possible.$
$Hence the answer is (A).$

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