Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

  • [JEE MAIN 2021]
  • A

    $\mathrm{CuCl}_{2}$

  • B

    $\mathrm{AgCl}$

  • C

    $\mathrm{ZnCl}_{2}$

  • D

    $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$

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