Iron powder and powder of rust are taken in two containers X and Y respectively. Dilute sulphuric acid is added two containers

Options

A. Effervescence is observed in both the containers.
B. Effervescence is observed in X but not in Y.
C. Effervescence is observed in Y but not in X.
D. No effervescence is observed in any of the containers.

Explanation

### Step-by-Step Solution:

1. **Identify the Substances in Each Container:**
- Container X contains iron powder (Fe).
- Container Y contains rust powder (FeO).

2. **Add Dilute Sulfuric Acid to Each Container:**
- For Container X (iron powder):
- When dilute sulfuric acid (H₂SO₄) is added to iron powder, a chemical reaction occurs.
- The reaction can be represented as:
\[ \text{Fe} + \text{H}_2\text{SO}_4 \rightarrow \text{FeSO}_4 + \text{H}_2 \]
- This reaction produces iron(II) sulfate (FeSO₄) and hydrogen gas (H₂).

3. **Observe the Reaction in Container X:**
- The production of hydrogen gas leads to effervescence (bubbles).
- Therefore, effervescence is observed in Container X.

4. **For Container Y (rust powder):**
- When dilute sulfuric acid is added to rust powder (FeO), another reaction occurs:
- The reaction can be represented as:
\[ \text{FeO} + \text{H}_2\text{SO}_4 \rightarrow \text{FeSO}_4 + \text{H}_2\text{O} \]
- This reaction produces iron(II) sulfate (FeSO₄) and water (H₂O).

5. **Observe the Reaction in Container Y:**
- In this case, no hydrogen gas is produced.
- Therefore, there is no effervescence observed in Container Y.

6. **Conclusion:**
- Effervescence is observed in Container X (with iron powder) but not in Container Y (with rust powder).
- The correct answer is that effervescence is observed in X but not in Y.