Which gas is generally released when an acid reacts with an active metal?
Answer and explanation
Correct answer: Hydrogen
An active metal can displace hydrogen from a dilute acid. The general reaction is: metal + acid → salt + hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Therefore hydrogen is released, making option A correct. Oxygen and nitrogen are not produced in this ordinary acid-metal reaction, while carbon dioxide is characteristic of an acid reacting with a carbonate or bicarbonate.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
An active metal can displace hydrogen from a dilute acid. The general reaction is: metal + acid → salt + hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Therefore hydrogen is released, making option A correct. Oxygen and nitrogen are not produced in this ordinary acid-metal reaction, while carbon dioxide is characteristic of an acid reacting with a carbonate or bicarbonate.
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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