Question detail
When an acid reacts with a metal, what gas is typically produced?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of acids
Question
- A. Oxygen
- B. Nitrogen
- C. Hydrogen
- D. Carbon dioxide
Answer
Hydrogen
Explanation
The reaction between an acid and a metal typically produces hydrogen gas as one of the products.
Common mistake
Incorrect balancing of metal‑acid equations
Students often write the metal on the left and the acid on the right, or they forget to balance hydrogen gas and salt ions, leading to unbalanced equations such as HCl + Zn → ZnCl₂ + H₂
Ensure the metal is on the left, the acid on the right, and that the equation is balanced for all atoms and charge. For example, Zn + 2 HCl → ZnCl₂ + H₂
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