What does the sign $↓$ indicates in a chemical reaction. Also identify the type of reaction.

release of gas, displacement reaction

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dissolution of gas, decomposition reaction

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formation of a precipitate, precipitation reaction

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lowering of temperature, decomposition reaction

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Solution

The correct option is C formation of a precipitate, precipitation reaction
The sign $↓$ indicates the formation of the precipitate and the type of reaction is precipitation reaction (type of double displacement reaction).

$B a C l_{2} (a q) + N a_{2} S O_{4} (a q) \to B a S O_{4} ↓ + 2 N a C l (a q)$ . In this reaction $B a S O_{4}$ is a precipitate.

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Why does chemical reaction occur? What are the different types of chemical reaction.

H_{2} O_{2} (l) U V - - \to H_{2} O (l) + O_{2} (g)

2 N a (s) + S (s) F u s e - -- \to N a_{2} S (s)

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