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How will you indicate the following …

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How will you indicate the following affects in a chemical equations? (a) Evolution of gas (b) Formation of precipitate (c) A solution made in water (d) Exothermic reaction (e) Endothermic reaction

Posted by Naresh Garg 4 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 4 years ago

The various characteristics of chemical reactions are:

Evolution of a gas: The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas.
Formation of a precipitate: The chemical reaction between potassium iodide and lead nitrate is characterised by the formation of a yellow precipitate of lead iodide.
Change in colour: The chemical reaction between citric acid and purple coloured potassium permanganate solution is characterised by change in colour (from purple to colourless).
Change in temperature: The reaction between quick lime and water to form slaked lime is characterised by a change in temperature.
Change in state: When wax is burned, then water and carbon dioxide are formed. Wax is a solid; water is a liquid whereas carbon dioxide is a gas.

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