Q30 / 150 · MHT CET 2021 (24 Sep Shift 2) · Chemistry

Which among the following cations will not form coloured compounds? (Atomic number $\mathrm{Cu}=29, \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Mn}=25$ )

  • A
    $\mathrm{V}^{3+}$
  • B
    $\mathrm{Ti}^{3+}$
  • Correct answer
    C
    $\mathrm{Cu}^{+}$
  • D
    $\mathrm{Mn}^{2+}$

Solution

$\mathrm{Cu}^{+}$ion will not form coloured aqueous solution as it does not contain unpaired electrons. $\mathrm{Cu}^{+}$ion with $3 \mathrm{~d}^{10}$ outer electronic configuration has zero unpaired electrons.

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

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