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Chemistry · 2025 · 1 mark
CBSE 2025 · Region 5 · Set 1 · Q9
In which of the following groups are both ions coloured in aqueous solution? I. Cu^+ II. Ti^4+ III. Co^2+ IV. Fe^2+ [Atomic number: Cu =29, Ti =22,…
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
(C)
III and IV
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