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Which gas is generally released when an acid reacts with a metal?

Answer and explanation

Correct answer: Hydrogen

A dilute acid reacts with a reactive metal, such as zinc, to form a salt and hydrogen gas. For example: \(Zn + 2HCl \rightarrow ZnCl_2 + H_2\). Therefore, hydrogen is the correct answer. Carbon dioxide is produced when an acid reacts with a carbonate or hydrogen carbonate, not with a metal. Exam tip: Hydrogen burns with a ‘pop’ sound when tested with a burning splint.

Related tags

Acid-Metal ReactionHydrogen GasReactive MetalsChemical ReactionsClass 10 Science

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