Two complexes `[Cr(H_(2)O_(6))_(6)]Cl_(3)` and `[Cr(NH_(3))_(6)]Cl_(3)` (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is :

Options

A. Both are paramagnetic with three unpaired electrons
B. `Delta_(0)` value of (A) is less than that of (B)
C. `Delta_(0)` values of (A) and (B) are calculated from the energies violet and yellow light, respectively.
D. Both absorb energies corresponding to their complementary colors.

Answer

To solve the question regarding the two complexes `[Cr(H2O)6]Cl3` (A) and `[Cr(NH3)6]Cl3` (B), we need to analyze their properties and the statements given about them.

### Step-by-Step Solution:

1. **Identify the Complexes and Their Colors:**
- Complex A: `[Cr(H2O)6]Cl3` is violet in color.
- Complex B: `[Cr(NH3)6]Cl3` is yellow in color.

2. **Determine the Oxidation States:**
- In both complexes, the ligands (H2O and NH3) are neutral.
- Therefore, the oxidation state of Cr in both complexes is +3.

3. **Electronic Configuration of Chromium:**
- The electronic configuration of Cr is `[Ar] 3d^5 4s^1`.
- In the +3 oxidation state, Cr loses three electrons, resulting in the configuration `[Ar] 3d^3`.

4. **Magnetic Properties:**
- Both complexes have unpaired electrons in the d-orbitals.
- Since Cr in both complexes has three unpaired electrons, both complexes are paramagnetic.

5. **Color and Absorption:**
- Complex A (violet) absorbs light in the yellow region of the spectrum.
- Complex B (yellow) absorbs light in the violet region of the spectrum.
- The color observed is complementary to the color absorbed.

6. **Delta (Δ) Values:**
- The energy difference (Δ) between the d-orbitals is related to the color absorbed.
- Since violet light has a shorter wavelength (higher energy) than yellow light, we conclude that Δ for complex B is greater than Δ for complex A.

7. **Evaluate the Statements:**
- The statement that "delta values of A and B are calculated from the energies of the violet and yellow light respectively" is incorrect because the Δ values are based on the color absorbed, not the color observed.

### Conclusion:
The incorrect statement regarding the two complexes is that "delta values of A and B are calculated from the energies of the violet and yellow light respectively."