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प्रश्न
What do you understand by precipitation reaction? Explain with examples.
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उत्तर
Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. A precipitate is a solid that forms out of solution.
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संबंधित प्रश्न
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
Explain the type of reactions on the basis of the direction of reaction.
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.
A reaction between an acid and a base is called ______.
Classify the following processes into physical or chemical changes:
- Beating of aluminium metal to make aluminium foil.
- Digestion of food.
- Cutting of a log of wood into pieces.
- Burning of crackers.
Photosynthesis is a chemical charge. Justify your answer.
______ is the chemical name of rust.
