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प्रश्न
What does one mean by endothermic reaction? Give example.
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उत्तर १
Reactions in which energy is absorbed are known as endothermic reactions.
Example: \[\ce{N2(g) + O2(g) + Heat -> 2NO(g)}\]
\[\ce{2NH3(g) + Heat -> N2(g) + 3H2(g)}\]
उत्तर २
A reaction in which heat is absorbed is called an endothermic reaction.
Example: When silver chloride is left in the sunlight, it absorbs heat and turns grey because of the formation of silver metal.
\[\ce{2AgCl(s)->[Sunlight] 2Ag(s) + Cl2(g)}\]
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संबंधित प्रश्न
What does one mean by exothermic reaction? Give example.
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A solid substance P which is very hard is used in the construction of many buildings, especially flooring. When substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water with the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P.
- What is substance P? Write its common name as well as chemical formula.
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\[\ce{NH4Cl -> NH3 + HCl}\]
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Exposure of silver chloride to sunlight for a long duration turns grey due to
(i) the formation of silver by decomposition of silver chloride.
(ii) sublimation of silver chloride.
(iii) decomposition of chlorine gas from silver chloride.
(iv) oxidation of silver chloride.
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- Name the process that occurs. Why is it called so?
- Illustrate the reaction of the process with the help of a chemical equation.
