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What does one mean by endothermic reaction? Give example. - Science

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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: \[\ce{N2(g) + O2(g) + Heat -> 2NO(g)}\]
\[\ce{2NH3(g) + Heat -> N2(g) + 3H2(g)}\]

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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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अध्याय 1: Chemical Reactions and Equations - Exercises [पृष्ठ १५]

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एनसीईआरटी Science [English] Class 10
अध्याय 1 Chemical Reactions and Equations
Exercises | Q 9 | पृष्ठ १५

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संबंधित प्रश्न

Write one equation for decomposition reactions where energy is supplied in the form of heat.


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.
(a) What is substance P? Write its common name as well as chemical formula.
(b) What is substance Q?
(c) What is gas R?
(d) What is substance S? What is its clear solution known as?
(e) What is substance T? Name any two natural forms in which substance T occurs in nature.


What type of reaction is represented by the digestion of food in our body?


What type of reaction is represented by the following equation?

CaCO3  →  CaO  +  CO2

 


What type of reaction is represented by the following equation?

NH4 CI → NH3  +  HCI


When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out.
(a) Name the iron salt.
(b) Name the type of reaction that takes place during the heating of iron salt.
(c) Write a chemical equation for the reaction involved.


How will you obtain  Nitrogen dioxide from lead nitrate.
Also give balanced equations for the reactions


What are thermal decomposition reactions ? Explain with an example.


What do you mean by redox reaction ? Explain with the help of an example.


(a) Design an activity to demonstrate the decomposition reaction of lead nitrate.

(b) Draw labelled diagram of the experimental set-up. List two main observations.

(c) Write balanced chemical equation for the reaction stating the physical state of the reactant and the products.


Rewrite the following statement by selecting the correct option:
________________ is a decomposition reaction.

The chemical reaction in which two or more products are formed from a single reactant is called _______ reaction.


What is electrolysis?


Electrolysis is type of ______ reaction.


Balance the following chemical equation and identify the type of chemical reaction.

`"HgO"("s") overset("(heat)")(->) "Hg"("l") + "O"_2("g")`


When lead nitrate is heated strongly in a boiling tube, two gases are liberated and a solid residue is left behind in the test tube.

  1. Name the type of chemical reaction and define it.
  2. Write the name and formula of the coloured gas liberated.
  3. Write the balanced chemical equation for the reaction.
  4. Name the residue left in the test tube and state the method of testing its nature (acidic/basic).

Write one equation for decomposition reactions where energy is supplied in the form of light.


A solution of a substance ‘X’ is used for whitewashing.

  1. Name the substance ‘X’ and write its formula.
  2. Write the reaction of the substance ‘X’ named in the above formula with water.

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