Advertisements
Advertisements
प्रश्न
Give an example of a reaction where the following are involved:
Close contact
उत्तर
\[\ce{Pb(NO3)2(s) + 2KI (s) -> 2KNO3 + PbI2 (s)}\]
APPEARS IN
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 –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- 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.