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प्रश्न
What does one mean by exothermic reaction? Give example.
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उत्तर १
Reactions in which heat is released along with the formation of products are called exothermic chemical reactions.
Example: \[\ce{C(s) + O2(g) -> CO2(g) + Heat}\]
\[\ce{2H2(g) + O2(g) -> 2H2O(l) + Heat}\]
उत्तर २
A reaction in which heat is released is called an exothermic reaction. Burning of fuel is an example of exothermic reaction. When methane is burned, it gives heat along with carbon dioxide and water.
\[\ce{CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l) + Heat}\]
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संबंधित प्रश्न
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity
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- What is compound A?
- What is compound B?
- What is gas C?
- What do you think is the black substance X? What is its function?
- What is the general name of substances like X?
State an important use of decomposition reactions.
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- Name the type of reaction that takes place during the heating of iron salt.
- Write a chemical equation for the reaction involved.
What does one mean by endothermic reaction? Give example.
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- Name the type of chemical reaction and define it.
- Write the name and formula of the coloured gas liberated.
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- Name the residue left in the test tube and state the method of testing its nature (acidic/basic).
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- Name the substance ‘X’ and write its formula.
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