Which gas is released when an acid reacts with an active metal?
Answer and explanation
Correct answer: Hydrogen
An active metal placed in a dilute acid generally displaces hydrogen from the acid. The reaction produces a salt and hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Therefore option A is correct. Carbon dioxide is released when an acid reacts with a carbonate or hydrogencarbonate, not an ordinary active metal. Oxygen and nitrogen are not the usual gaseous products of this acid-metal reaction.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
An active metal placed in a dilute acid generally displaces hydrogen from the acid. The reaction produces a salt and hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Therefore option A is correct. Carbon dioxide is released when an acid reacts with a carbonate or hydrogencarbonate, not an ordinary active metal. Oxygen and nitrogen are not the usual gaseous products of this acid-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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
