State main characteristics of chemical reaction. give at least one example in each case
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Some chemical reactions are characterised by the evolution of gas. For Ex:1)Reaction between zinc and dilute sulphuric acid to form hydrogen gas. 2)Reaction between sodium carbonate and dilute hydrochloric acid to form carbon dioxide gas. Some chemical reactions are characterised by the formation of precipitate.
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The product can't change back to reactant.
Energy is produced.
Explanation:
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