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AP EAMCET202120 Aug 2021Morning ShiftChemistryd and f Block ElementsActual

Which among the following is colored?

Options

  1. ACuCl
  2. BScCl 3
  3. CCuCl 2
  4. DTiCl 4

Correct answer

C. CuCl 2

Step-by-step solution

CuCl has the copper in + 1 oxidation state. It has the ten electrons in d-orbital. All the electrons are paired. So, it is not coloured. ScCl 3 has the Sc 3 + . It has the d 0 configuration. It has all paired electrons. So, it has no colour. CuCl 2 has the Cu 2 + . It has the d 9 configuration. So, it has the unpaired electron. So, it can show the colour due to d - d transition by the unpaired electron. So, it is coloured compound. TiCl 4 has the Ti 4 + . It has the d 0 configuration. It has all paired electrons. S

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