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Give an example of a reaction where the following are involved: Close contact - Chemistry

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प्रश्न

Give an example of a reaction where the following are involved:

Close contact

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उत्तर

\[\ce{Pb(NO3)2(s)  + 2KI (s) -> 2KNO3 + PbI2 (s)}\]

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

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सेलिना Concise Chemistry [English] Class 9 ICSE
पाठ 2 Chemical Changes and Reactions
Exercise 2 (A) | Q 3.4 | पृष्ठ २३

संबंधित प्रश्‍न

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


TRUE \ FALSE

Copper can displace iron from iron sulphate.


TRUE \ FALSE

Electrolytic refining is a method in which a thin coating of a metal is done over another metal.


How is precipitate formation in a chemical reaction indicated?


Is kerosene an electrolyte or a non-electrolyte ?


Name the type of chemical reaction shown by the following equation :

Fe2O3 + 2Al → Al2O3 + 2Fe


Give an example of a reaction where the following are involved

Catalyst


Give reason for the following:

Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.


Multiple choice:

A reaction of a type: AB + CD → AD + CD, involves


Multiple choice:

Thermal decomposition of sodium carbonate will produce


Give a chemical test to distinguish between the following gases. 

HCl and Cl2


Select the correct answer for the following options:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.


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 – Addition of water to quicklime.


Complete the table given below.

Addition of dil. H2SO4 to KHCO3  Name of residue obtained  

Complete the table given below.

Heat on sodium chloride Colour imparted to flame during flame test  

Differentiate between the following:

Neutralization reaction and a precipitation reaction.


The percentage composition of Nitrogen in Ureas is ______.


What is the use of indicator?


A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

Are these changes chemical in nature?


We are advised to not to play with fireworks. Give reason.


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