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प्रश्न
State the following reaction whether heat is evolved or absorbed –
water is added to quicklime
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उत्तर
When water is added to quicklime heat is evolved.
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संबंधित प्रश्न
What do you observe when ammonium chloride is dissolved in water.
FILL IN THE BLANK
In a................ reaction heat energy is absorbed.
Explain the term with examples.
Endothermic reaction
Give an example of the following chemical changes.
An exothermic and an endothermic reaction involving carbon as one of the reactants.
Chemical reactions may proceed with absorption of heat. Give an example.
Give an example with a balanced equation, of the following reaction:
exothermic reaction
Differentiate between the following:
Electrolytic decomposition and photochemical decomposition.
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.
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.
