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In an unknown chemical reaction, a gas was evolved and the container became cold. Which conclusion is the most cautious?

Answer and explanation

Correct answer: A gas was produced, and the reaction may have absorbed heat.

Evolution of a gas is an observable sign of a chemical reaction. A cooling container suggests that the reaction may be taking heat from its surroundings, so it may be endothermic. However, these observations alone do not establish that combustion or rusting definitely occurred.

Related tags

ScienceClass 10Chemical ReactionsEndothermic ReactionGas EvolutionObservations

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