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प्रश्न
Mention any two exothermic reactions.
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उत्तर
Burning of magnesium ribbon and burning of a candle.
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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
Identify the endothermic and exothermic reaction.
HCl + NaOH → NaCl + H2O + heat
Give an example of the following chemical changes.
A reaction involving blue solution.
Assertion: A drop of petrol when touched with finger gives a chill feeling.
Reason: The above phenomenon is an endothermic one.
The Dissolution of glucose in water is also an ______ change.
Match the following:
| Colum I | Column II | ||
| 1. | Alloying | a. | Exothermic change |
| 2. | Crystallization | b. | Periodic change |
| 3. | Soap powder + water | c. | Mixing of molten solids |
| 4. | Seasonal changes | d. | Pure solid |
Give scientific reasons.
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 reasons.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
