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Define Electrochemical Reaction Give an Example - Chemistry

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प्रश्न

Define Electrochemical reaction
Give an example 

 

 

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एक पंक्ति में उत्तर

उत्तर

 It is a reaction which occurs with absorption of electrical energy.

\[\ce{2H2O + ->[Electricity] 2H2 + O2}\]

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अध्याय 2: Chemical Changes and Reactions - Exercise 2 (A) [पृष्ठ २३]

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सेलिना Concise Chemistry [English] Class 9 ICSE
अध्याय 2 Chemical Changes and Reactions
Exercise 2 (A) | Q 4.2 | पृष्ठ २३

संबंधित प्रश्न

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.


How would you show that setting of curd is a chemical change?


 Fill in the blank.
 The formation of gas bubbles in a liquid during a reaction is called ......................


Define catalyst.


                                    MATCH THE COLUMNS

1 . `H_2` + `CI_2` `→` 2HCI    a. displacement reaction
2. `2FeCI_3`+ `H_2`  `→` `2FeCI_2` +2HCI` b. addition of an electronegative redical 
3. Fe + `CuSO_4` `→``FeSO_4` +Cu`  c. removal of an electronegative redical 
4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` d.reduction by adding hydrogen
5. 3Fe +`3CI_2` `→` `2FeCI_3` e.electrolysis of water
6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI F.double decomposition,precipitation reaction
7.`2H_2O` `→` `2H_2``↑`+`O_2` e. combination or synthesis reaction

 


Fill in the blank:

During a chemical reaction transfer of ________ takes place.


Define:
Electrochemical reaction
Give one example


Complete the following table and write your observations.

 

Hydrogen sulphide

Ammonia

Sulphur dioxide

Hydrogen chloride

Shake the gas with red litmus solution

       

Shake the gas with blue litmus solution

       

Apply a burning splint to a gas

       

Give a chemical test to distinguish between the following gases. 

H2 and CO2


Give a chemical test to distinguish between the following gases. 

HCl and H2S


Name the following:

The products obtained during ‘photosynthesis’ – which is a chemical change.


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.


Match the chemical reactions in List I with the appropriate answer in List II.

  List I   List II
1. \[\ce{XY⇌[heat]X + Y}\] A: Displacement reaction
2. \[\ce{XY->X + Y}\] B: Double decomposition
3. \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] C: Endothermic reaction
4. \[\ce{X + YZ->XZ + Y}\] D: Thermal dissociation
5. \[\ce{X + Y->[heat]XY -\Delta}\] E: Decomposition reaction

Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Calcium hydroxide.


Burning of paper is a ______ change.


When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.


Chemists identify gypsum as a natural indicator.


Iron and rust are the same substances.


Give an example where heat, light, and sound are produced during a chemical change.


Write a note on the following:

Curdling of milk


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