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When a metal reacts with a dilute acid, the gas usually evolved is
Aoxygen
Bcarbon dioxide
Chydrogen
Dchlorine
Answer & Solution
Correct answer: C. hydrogen
1. Reactive metals react with dilute acids: Metal + dilute acid → salt + gas.
2. The gas released is **hydrogen** (it burns with a 'pop' sound).
3. e.g. Fe + H₂SO₄ → FeSO₄ + H₂. (Nitric acid is an exception as it is a strong oxidiser.)
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch3 'Metals and Non-metals', §3.2.3_
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