What does the sign " $↓$ " indicates in a chemical reaction?

release of gas

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dissolution of gas

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formation of a precipitate

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lowering of temperature

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Solution

The correct option is C formation of a precipitate
The sign $↓$ indicates the formation of the precipitate in a chemical reaction. For example,
$B a C l_{2} (a q) + N a_{2} S O_{4} (a q) \to B a S O_{4} ↓ + 2 N a C l (a q)$ .
In this reaction $B a S O_{4}$ is a precipitate.

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