Observation:
- Deep violet color

Explanation:
The addition of Na2O2 and ether to an acidified dichromate solution results in the observation of a deep violet color. This can be explained by the following reactions and processes:

1. Acidification of Dichromate Solution:
- The initial solution is an acidified dichromate solution, which typically contains chromium ions in the +6 oxidation state (Cr6+).
- The acidification is usually done by adding a strong acid such as sulfuric acid (H2SO4).
- The acidification helps in stabilizing the dichromate ions (Cr2O7 2-) and maintaining the desired redox potential for the subsequent reactions.

2. Addition of Na2O2:
- Sodium peroxide (Na2O2) is a powerful oxidizing agent.
- When Na2O2 is added to the acidified dichromate solution, it reacts with the dichromate ions.
- The reaction can be represented as follows:
Cr2O7 2- + 3Na2O2 + 2H2SO4 -> 2CrO5 + 3Na2SO4 + 4H2O
(Dichromate) (Sodium peroxide) (Peroxochromic acid)

3. Formation of Peroxochromic Acid (CrO5):
- The reaction between dichromate ions and sodium peroxide leads to the formation of peroxochromic acid (CrO5).
- Peroxochromic acid is an unstable compound and decomposes rapidly.
- During the decomposition, it releases oxygen gas and forms various chromium species.
- The deep violet color observed is attributed to the formation of one of these chromium species.

4. Deep Violet Color:
- The deep violet color observed is likely due to the formation of a chromium species with an intermediate oxidation state, such as Cr(V) or Cr(IV).
- These species can absorb certain wavelengths of light, leading to the observed color.
- The exact nature of the chromium species responsible for the color cannot be determined without further analysis.

In conclusion, when Na2O2 and ether are added to an acidified dichromate solution, the observation of a deep violet color indicates the formation of a chromium species with an intermediate oxidation state. Further analysis would be required to identify the exact nature of this species.