General Science • ChemistryEasy
Which gas is liberated when dilute hydrochloric acid reacts actively with an active metal such as zinc?
A. Oxygen gas
B. Hydrogen gas✓ Correct Answer
C. Carbon dioxide gas
D. Nitrogen dioxide gas
💡 Solution & Explanation
When an active metal like zinc reacts with dilute hydrochloric acid, it undergoes a single displacement reaction producing zinc chloride and releasing hydrogen gas, which burns with a characteristic pop sound when tested with a burning splinter. Metals below hydrogen in the reactivity series, such as copper, do not liberate hydrogen from dilute acids. Hydrochloric acid is a strong mineral acid produced naturally in the human stomach.
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