What happens when an acid reacts with a metal?

Correct Answer: It produces hydrogen gas and a salt

Subject: chemistry

• It produces carbon dioxide gas
• It produces hydrogen gas and a salt
• It forms water and a salt
• No reaction occurs

Explanation: • <b>Key Fact</b> Active metals react with acids to displace hydrogen, forming a salt and releasing Hydrogen (H₂) gas. • <b>Supporting Detail</b> Example: Zn + 2HCl → ZnCl₂ + H₂↑. • <b>Related Concept</b> Only active metals (above hydrogen in the reactivity series) can do this. • <b>Why wrong options are wrong</b> CO₂ is released when acids react with metal carbonates, not pure metals. • <b>Exam Trick</b> Metal + Acid = H₂ pop sound test. • <b>Additional Info</b> Bases also react with certain metals (like Zn, Al) to release H₂ gas.

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