Which gas is formed when an acid reacts with an active metal?
Answer and explanation
Correct answer: Hydrogen
Many active metals displace hydrogen from dilute acids. The general reaction is: metal + acid → salt + hydrogen gas. For example, zinc reacts with hydrochloric acid as Zn + 2HCl → ZnCl₂ + H₂. Thus hydrogen is the gas formed, so option B is correct. Carbon dioxide is associated with acid–carbonate reactions, whereas oxygen and nitrogen are not released in this standard reaction.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
Many active metals displace hydrogen from dilute acids. The general reaction is: metal + acid → salt + hydrogen gas. For example, zinc reacts with hydrochloric acid as Zn + 2HCl → ZnCl₂ + H₂. Thus hydrogen is the gas formed, so option B is correct. Carbon dioxide is associated with acid–carbonate reactions, whereas oxygen and nitrogen are not released in this standard 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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