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What is the incorrect statement regarding two given complexes Cr H 2 O 6 Cl 3 A and Cr NH 3 6 Cl 3 B , which are violet and yellow coloured respectively?

Options

  1. ABoth are paramagnetic with three unpaired electrons
  2. BΔ 0 value of A is less than that of B
  3. CΔ 0 values of A and B are calculated from the energies violet and yellow light, respectively.
  4. DBoth absorb energies corresponding to their complementary colors.

Correct answer

C. Δ 0 values of A and B are calculated from the energies violet and yellow light, respectively.

Step-by-step solution

Δ 0 A < Δ 0 B , both complexes have CN = 6 , B has strong field ligand and A has weak field ligand so Δ 0 A < Δ 0 B In both complexes, Cr has 3 unpaired electrons and hence, will be paramagnetic Cr H 2 O Cl 3 Cr + 3 = 1 S 2 2 S 2 2 p 6 3 S 2 3 p 6 3 d 3 in strong field ligand or weak field ligand is t 2 g 111 , eg o Δ 0 order will be compared by spectrochemical series not by energies of violet and yellow light. Hence incorrect

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