Why does copper generally not produce hydrogen gas with dilute hydrochloric acid?
Answer and explanation
Correct answer: Because copper is less reactive than hydrogen
The governing concept is the reactivity series and displacement of hydrogen from acids. A metal can liberate hydrogen from a dilute non-oxidising acid only when it is more reactive than hydrogen. Copper lies below hydrogen in the reactivity series, so it cannot displace hydrogen ions from dilute hydrochloric acid under ordinary conditions. The other statements are chemically false: copper is a solid metal, the dilute acid contains water, and hydrogen is a non-metal.
Frequently asked questions
What is the correct answer to this question?
Because copper is less reactive than hydrogen
Why is this the correct answer?
The governing concept is the reactivity series and displacement of hydrogen from acids. A metal can liberate hydrogen from a dilute non-oxidising acid only when it is more reactive than hydrogen. Copper lies below hydrogen in the reactivity series, so it cannot displace hydrogen ions from dilute hydrochloric acid under ordinary conditions. The other statements are chemically false: copper is a solid metal, the dilute acid contains water, and hydrogen is a non-metal.
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.
