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प्रश्न
Chemical reactions may proceed with evolution of heat. Give an example.
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उत्तर
Chemical reaction is characterised by evolution of heat:
\[\ce{\underset{\text{carbon}}{C} +\underset{\text{oxygen}}{O2}->\underset{\text{carbon dioxide}}{CO2} + Heat}\]
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संबंधित प्रश्न
What do you observe when ammonium chloride is dissolved in water.
Identify the endothermic and exothermic reaction.
\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]
Give scientific reasons.
While preparing dil. Sulphuric acid from concentrated conc. sulphuric acid in the laboratory the concentrated sulphuric acid is, add slowly to water with constant stirring.
Give an example of the following chemical changes.
A reaction involving blue solution.
Why energy is involved in a chemical change?
What do you observe? When
Lead nitrate is heated.
Give a balanced equation for the following type of reaction:
A catalytic, reversible, exothermic reaction.
Select the correct answer from the options given below:
State the gaseous product formed, when
Two gases one of them neutral combines by absorption of light energy.
Select the correct answer from the options given below:
State the gaseous product formed, when
An exothermic reaction takes place between ammonia and neutral gas.
Give scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
