In the general reaction of an acid and a metal, what forms along with salt?
Answer and explanation
Correct answer: Hydrogen gas
The governing rule is that a sufficiently reactive metal displaces hydrogen from an acid. In general form, metal + acid → salt + hydrogen gas. For example, Mg + 2HCl → MgCl₂ + H₂. Therefore option A is correct. Oxygen is not the usual product of this reaction, water is associated with acid–base neutralisation, and carbon dioxide is produced when an acid reacts with a carbonate or hydrogen carbonate.
Frequently asked questions
What is the correct answer to this question?
Hydrogen gas
Why is this the correct answer?
The governing rule is that a sufficiently reactive metal displaces hydrogen from an acid. In general form, metal + acid → salt + hydrogen gas. For example, Mg + 2HCl → MgCl₂ + H₂. Therefore option A is correct. Oxygen is not the usual product of this reaction, water is associated with acid–base neutralisation, and carbon dioxide is produced when an acid reacts with a carbonate or hydrogen carbonate.
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.
