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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:
\[\ce{\underset{\text{carbon}}{C} +\underset{\text{oxygen}}{O2}->\underset{\text{carbon dioxide}}{CO2} + Heat}\]
APPEARS IN
संबंधित प्रश्न
Define exothermic reactions. Give two examples of each.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Heat energy is evolved in these reactions
- Thermal decomposition reactions
- Exothermic reactions
- Endothermic reactions
- None of these
FILL IN THE BLANK
In a................ reaction heat energy is absorbed.
Identify the endothermic and exothermic reaction.
\[\ce{2KClO_{3(s)}->[\Delta] 2KCl_{(s)} + 3O2}\]
Name a nitrate which produces oxygen as the only gas.
Complete the statement by filling in the blank with the correct word:
The reaction of coke with steam to give water gas is an example of an __________ reaction.
Give an example of an endothermic reaction.
Supply of energy may be required to initiate a reaction. State the different forms with a suitable example of reactions initiated by the supply of energy.
Assertion: A drop of petrol when touched with finger gives a chill feeling.
Reason: The above phenomenon is an endothermic one.
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.
