Why is gas not released every time a metal is added to an acidic solution?
Answer and explanation
Correct answer: Because the metal must be sufficiently reactive
The governing concept is the reactivity series and displacement of hydrogen from acids. A sufficiently reactive metal loses electrons and reduces H⁺ ions to hydrogen gas: metal + acid → salt + H₂. Metals below hydrogen in the reactivity series, such as copper with dilute non-oxidising acids, generally do not displace hydrogen, so no gas is observed. Hence option A is correct; the other statements deny the known composition or reactions of acids.
Frequently asked questions
What is the correct answer to this question?
Because the metal must be sufficiently reactive
Why is this the correct answer?
The governing concept is the reactivity series and displacement of hydrogen from acids. A sufficiently reactive metal loses electrons and reduces H⁺ ions to hydrogen gas: metal + acid → salt + H₂. Metals below hydrogen in the reactivity series, such as copper with dilute non-oxidising acids, generally do not displace hydrogen, so no gas is observed. Hence option A is correct; the other statements deny the known composition or reactions of acids.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Metals and Non-metals.
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