Which gas is generally released when an acid reacts with an active metal?
Answer and explanation
Correct answer: Hydrogen
The governing concept is the acid–metal displacement reaction. An active metal displaces hydrogen from a dilute acid, producing a salt and hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Hydrogen can be tested cautiously by the squeaky-pop test under supervision. Oxygen, nitrogen, and chlorine are not the general products of this reaction. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
The governing concept is the acid–metal displacement reaction. An active metal displaces hydrogen from a dilute acid, producing a salt and hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Hydrogen can be tested cautiously by the squeaky-pop test under supervision. Oxygen, nitrogen, and chlorine are not the general products of this reaction. Therefore, option A is correct.
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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