Question:
Which gas is evolved when zinc reacts with dilute hydrochloric acid?
Which gas is evolved when zinc reacts with dilute hydrochloric acid?
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You can test for Hydrogen gas by bringing a burning splinter near the mouth of the test tube—it will burn with a characteristic "pop" sound!
Updated On: May 13, 2026
- Oxygen
- Chlorine
- Hydrogen
- Nitrogen
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Metals that are more reactive than hydrogen (positioned above hydrogen in the reactivity series) react with dilute acids to displace hydrogen gas.
Step 2: Detailed Explanation:
Zinc ($Zn$) is more reactive than hydrogen. When it reacts with hydrochloric acid ($HCl$), it forms zinc chloride and releases hydrogen gas. The chemical equation is: \[ Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g) \uparrow \]
Step 3: Final Answer:
Hydrogen gas is evolved during the reaction.
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