When an acid reacts with a metal, which one of the following gas is usually liberated?
Correct answer: D. Hydrogen gas
- A. Ammonia Gas
- B. Chlorine
- C. Oxygen
- D. Hydrogen gas
Explanation
Most metals react with dilute acids to form a salt and release hydrogen gas, producing bubbles. Strong oxidising acids such as concentrated nitric acid are exceptions, but hydrogen is the usual answer.
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