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What does an upward arrow
(


\uparrow


) after a product in a chemical equation indicate?

Answer and explanation

Correct answer: Evolution of a gas

In a chemical equation, an upward arrow
(


\uparrow


) written with a product indicates that a gas is formed and evolves. For example, hydrogen gas is produced when zinc reacts with dilute hydrochloric acid. In contrast, a downward arrow
(


\downarrow


) indicates the formation of a precipitate.

Related tags

ScienceClass 10Chemical ReactionsChemical EquationsGas EvolutionSymbols

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