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प्रश्न
Chemical reactions may proceed with absorption of heat. Give an example.
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उत्तर
Chemical reaction is characterised by absorption of heat:
\[\ce{\underset{\text{nitrogen}}{N2} + \underset{\text{oxygen}}{O2} + ->[3000°C]\underset{\text{nitrogen monoxide}}{2NO (g)}}\]
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संबंधित प्रश्न
How will you obtain Ammonia from nitrogen.
Also give balanced equations for the reactions
What do you observe when Ammonia is brought in contact of hydrogen chloride.gas.
Identify the endothermic and exothermic reaction.
\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]
Name a compound which produces carbon dioxide on heating.
State the following reaction whether heat is evolved or absorbed –
water is added to quicklime
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 with a balanced equation, of the following reaction:
electrochemical reaction
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 a 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.
