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 question regarding the reaction between hydrogen peroxide (H₂O₂) and potassium dichromate (K₂Cr₂O₇), we will break down the assertion and reason provided in the question step by step.

### Step 1: Understand the Reaction
The assertion states that H₂O₂ reacts with K₂Cr₂O₇ to give a blue color. This reaction occurs in an acidic medium. When H₂O₂ is added to K₂Cr₂O₇, it leads to the formation of chromium pentoxide (CrO₅), which is blue in color.

**Hint:** Identify the products formed in the reaction and their characteristics.

### Step 2: Write the Balanced Chemical Equation
In acidic medium, the reaction can be represented as follows:
\[ K_2Cr_2O_7 + H_2O_2 + H_2SO_4 \rightarrow CrO_5 + K_2SO_4 + H_2O \]
To balance this equation, we find that:
- 4 moles of H₂O₂ are required.
- 2 moles of CrO₅ are produced.
- 5 moles of H₂O are produced.

**Hint:** Ensure that the number of atoms of each element is the same on both sides of the equation.

### Step 3: Analyze the Role of H₂O₂
The reason states that H₂O₂ can act as a reducing agent. However, in this specific reaction, H₂O₂ acts as an oxidizing agent. This is because it facilitates the reduction of chromium from its +6 oxidation state in K₂Cr₂O₇ to a lower oxidation state in CrO₅, while itself being oxidized.

**Hint:** Determine the oxidation states of chromium before and after the reaction to understand the role of H₂O₂.

### Step 4: Conclusion on Assertion and Reason
- The assertion is true: H₂O₂ does react with K₂Cr₂O₇ to produce a blue color due to the formation of CrO₅.
- The reason is also true: H₂O₂ can act as a reducing agent, but in this case, it acts as an oxidizing agent. Therefore, the reason does not correctly explain the assertion.

**Hint:** Evaluate the relationship between the assertion and reason to determine if the reason supports the assertion.

### Final Answer
Based on the analysis:
- The assertion is true.
- The reason is true but does not correctly explain the assertion.

Thus, the correct option is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.