Q13 / 120 · VITEEE 2017 · Chemistry

Which group contains coloured ions out of (1) $\mathrm{Cu}^{2+}$ (2) $\mathrm{Ti}^{4+}$ (3) $\mathrm{Co}^{2+}$ (4) $\mathrm{Fe}^{2+}$

  • A
    $1,2,3,4$
  • Correct answer
    B
    $1,3,4$
  • C
    2,3
  • D
    1,2

Solution

$\begin{aligned} \mathrm{Cu}^{2+}[\mathrm{Ar}] 3 \mathrm{~d}^{9}, & \mathrm{Ti}^{4+}[\mathrm{Ar}] 3 \mathrm{~d}^{0} \\ & \mathrm{Co}^{2+}[\mathrm{Ar}] 3 \mathrm{~d}^{7}, \mathrm{Fe}^{2+}[\mathrm{Ar}] 3 \mathrm{~d}^{6} \end{aligned}$ $1,3,4$ are coloured ions hence the answer is $b$.

Hence, the correct answer is option: 'B'.

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