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प्रश्न
Define endothermic reactions. Give two examples of each.
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उत्तर
Endothermic reaction: A chemical reaction in which heat is absorbed is called endothermic reaction. It causes fall in temperature.
e.g. (i) When nitrogen and oxygen together are heated to a temperature of about 3000°C, nitric oxide gas is formed.
N2 + O2 + heat → 2NO (g)
(ii) Decomposition of calcium carbonate into carbon dioxide and calcium oxide when heated to a 1000°C.
CaCO3 + Heat → CaO (s) + CO2 (g)
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संबंधित प्रश्न
Define exothermic reactions. Give two examples of each.
State the effect of an endothermic reaction.
Identify the endothermic and exothermic reaction.
\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]
Name a nitrate which produces oxygen as the only gas.
State which type of chemical reaction proceeds with the absorption of heat energy.
Differentiate between the following:
A catalyst and a promoter.
Give an example of an endothermic reaction.
Give an example with a balanced equation, of the following reaction:
photochemical reaction
Complete the statement by filling in the blank with the correct word:
The reaction of hydrogen burning in oxygen to give a neutral liquid is an example of ________ 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 |
