CBSE 2025 · Region 5 · Set 1 · Q9 · 1 mark
In which of the following groups are both ions coloured in aqueous solution? I. $\displaystyle \mathrm{Cu}^{+}$ II. $\displaystyle \mathrm{Ti}^{4+}$ III. $\displaystyle \mathrm{Co}^{2+}$ IV. $\displaystyle \mathrm{Fe}^{2+}$ [Atomic number: $\displaystyle \mathrm{Cu}=29, \quad \mathrm{Ti}=22, \quad \mathrm{Co}=27, \quad \mathrm{Fe}=26$ ]
Official answer
From CBSE’s own marking scheme for this paper.
(C)
III and IV
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)Remembermcqmedium
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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.