Which of the following compounds, on reaction with NaOH and `Na_(2)O_(2)` gives yellow colour?

Options

A. `Zn(OH)_(2)`
B. `AI(OH)_(3)`
C. `Cr(OH)_(3)`
D. `CaCO_(3)`

Explanation

To determine which compound reacts with NaOH and Na2O2 to give a yellow color, we need to analyze the given compounds: zinc hydroxide, aluminum hydroxide, chromium hydroxide, and calcium carbonate.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- Zinc hydroxide (Zn(OH)₂)
- Aluminum hydroxide (Al(OH)₃)
- Chromium hydroxide (Cr(OH)₃)
- Calcium carbonate (CaCO₃)

2. **Understand the Reaction Conditions:**
- The reaction involves sodium hydroxide (NaOH) and sodium peroxide (Na2O2).
- Sodium peroxide can act as an oxidizing agent in the presence of hydroxides.

3. **Evaluate Each Compound:**
- **Zinc Hydroxide (Zn(OH)₂):** This compound does not typically produce a yellow color when reacted with NaOH and Na2O2.
- **Aluminum Hydroxide (Al(OH)₃):** This compound also does not yield a yellow color under these conditions.
- **Chromium Hydroxide (Cr(OH)₃):** When chromium hydroxide reacts with NaOH and Na2O2, it forms sodium chromate (Na2CrO4), which is yellow in color.
- **Calcium Carbonate (CaCO₃):** This compound does not produce a yellow color when reacted with NaOH and Na2O2.

4. **Conclusion:**
- The compound that gives a yellow color upon reaction with NaOH and Na2O2 is **Chromium Hydroxide (Cr(OH)₃)**.

### Final Answer:
Chromium hydroxide (Cr(OH)₃) gives a yellow color when reacted with NaOH and Na2O2.

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