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Acid used in the laboratory for preparat...

Acid used in the laboratory for preparation of hydrogen.

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**Step-by-Step Text Solution:** 1. **Identify the Question**: The question asks for the acid used in the laboratory for the preparation of hydrogen. 2. **Understand the Context**: In a laboratory setting, hydrogen can be generated through a chemical reaction involving acids and metals. 3. **Identify the Acids**: The two common acids used for this purpose are hydrochloric acid (HCl) and sulfuric acid (H2SO4). 4. **Identify the Metal**: The metal typically used in these reactions is granulated zinc (Zn). 5. **Write the Chemical Reactions**: - When zinc reacts with hydrochloric acid: \[ \text{Zn (s) + 2 HCl (aq) } \rightarrow \text{ ZnCl}_2 \text{ (aq) + H}_2 \text{ (g)} \] - When zinc reacts with sulfuric acid: \[ \text{Zn (s) + H}_2\text{SO}_4 \text{ (aq) } \rightarrow \text{ ZnSO}_4 \text{ (aq) + H}_2 \text{ (g)} \] 6. **Explain the Role of Granulated Zinc**: Granulated zinc is preferred over pure zinc because it contains copper impurities. These impurities act as a catalyst, which increases the rate of the reaction. 7. **Conclusion**: Therefore, the acids used in the laboratory for the preparation of hydrogen are hydrochloric acid and sulfuric acid. ---
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