Which gas is released when an acid reacts with an active metal?
Answer and explanation
Correct answer: Hydrogen
An active metal displaces hydrogen from a dilute acid, producing a salt and hydrogen gas. For example, zinc reacts with hydrochloric acid as Zn + 2HCl → ZnCl₂ + H₂↑. Hence option A is correct. Carbon dioxide is commonly released when an acid reacts with a carbonate, whereas oxygen and nitrogen are not the usual products of an acid–active-metal reaction.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
An active metal displaces hydrogen from a dilute acid, producing a salt and hydrogen gas. For example, zinc reacts with hydrochloric acid as Zn + 2HCl → ZnCl₂ + H₂↑. Hence option A is correct. Carbon dioxide is commonly released when an acid reacts with a carbonate, whereas oxygen and nitrogen are not the usual products of an acid–active-metal reaction.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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