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प्रश्न
Write the effects of chemical reactions.
उत्तर
The effects of chemical reactions are:
1. Evolution of gas:
Gas evolution may take place as a result of chemical reactions.
Example: When diluting hydrochloric acid is added to a solution of sodium carbonate or sodium bicarbonate carbon dioxide gas is evolved.
2. Change in colour:
Certain chemical changes produce changes in colour.
Example: When you place an iron nail in a solution of copper sulphate, the blue colour of copper sulphate slowly changes into green due to a chemical reaction between iron copper sulphate solution.
3. Change in the state:
Certain chemical reaction change of state is observed.
Example: When you bum a piece of camphor, smoke comes out as a result of a chemical reaction between solid camphor and oxygen. Here, there is a change of state from solid to gas.
