A : `H_(2)O_(2)` reacts with `K_(2)Cr_(2)O_(7)` to give blue colour.
`H_(2)O_(2)` can act as reducing agent.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanantion of the assertion, then mark (2)
C. If assertion is true statements but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the problem, we need to analyze the reaction between hydrogen peroxide (H₂O₂) and potassium dichromate (K₂Cr₂O₇) and understand the roles of H₂O₂ as a reducing agent and the resulting color change.

### Step-by-Step Solution:

1. **Identify the Reactants:**
- The reactants in this reaction are hydrogen peroxide (H₂O₂) and potassium dichromate (K₂Cr₂O₇).

2. **Understand the Color Change:**
- Potassium dichromate (K₂Cr₂O₇) is orange in color. When it reacts with hydrogen peroxide in an acidic medium, it produces chromium pentoxide (CrO₅), which is blue in color.

3. **Write the Balanced Reaction:**
- The balanced chemical reaction can be represented as follows:
\[ K_2Cr_2O_7 + 3H_2O_2 + 4H_2SO_4 \rightarrow 2CrO_5 + K_2SO_4 + 5H_2O \]
- In this reaction, potassium dichromate is reduced, and hydrogen peroxide acts as a reducing agent.

4. **Determine the Role of H₂O₂:**
- Hydrogen peroxide can act as both an oxidizing agent and a reducing agent depending on the reaction conditions. In this case, it acts as a reducing agent because it reduces potassium dichromate (Cr²⁺) to chromium pentoxide (CrO₅).

5. **Oxidation States:**
- In H₂O₂, the oxidation state of oxygen is -1. When it is converted to water (H₂O), the oxidation state of oxygen changes to -2. This indicates that H₂O₂ is being oxidized, which means it is acting as a reducing agent in this context.

6. **Conclusion:**
- The assertion that H₂O₂ reacts with K₂Cr₂O₇ to give a blue color is correct. The reason that H₂O₂ can act as a reducing agent is also correct, but in this specific reaction, it is acting as an oxidizing agent. Therefore, while both statements are true, the explanation provided in the reason is incorrect.

### Final Answer:
- The assertion is true, and the reason is true, but the reason is not the correct explanation for the assertion. Therefore, the correct option is that both assertion and reason are true, but the reason is not a correct explanation of the assertion.