The aqueous solution containing which one of the
following ions will be colourless? (Atomic number:
Sc = 21, Fe = 26, Ti = 22, Mn = 25)
(a) Sc³⁺ (b) Fe²⁺
(c) Ti³⁺ (d) Mn²⁺
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Answer:
Correct option (a) Sc3+
Explanation : Sc3+ do not contain unpaired electron and hence it will not undergo d - d transition and do not show colour.
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