A metal does not give hydrogen gas with an acid, but zinc gives gas in the same acid. Which conclusion is correct?
Answer and explanation
Correct answer: The first metal may be less reactive than zinc
A metal above hydrogen in the reactivity series can generally displace hydrogen from a dilute non-oxidising acid. Since zinc reacts with the same acid and releases hydrogen, while the unnamed metal does not under the stated conditions, the first metal may be below zinc in reactivity. It cannot be identified as sodium, and the acid must contain replaceable hydrogen. Hence A is the valid conclusion.
Frequently asked questions
What is the correct answer to this question?
The first metal may be less reactive than zinc
Why is this the correct answer?
A metal above hydrogen in the reactivity series can generally displace hydrogen from a dilute non-oxidising acid. Since zinc reacts with the same acid and releases hydrogen, while the unnamed metal does not under the stated conditions, the first metal may be below zinc in reactivity. It cannot be identified as sodium, and the acid must contain replaceable hydrogen. Hence A is the valid conclusion.
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.
