MEDIUM
6th West Bengal Board
IMPORTANT
Earn 100

write valency for the given elements.
     Element    Symbol         Valency
Oxygen             O   
Nitrogen             N  
Carbon             C  
Sulphur             S  
Chlorine            Cl  
Fluorine             F  
Iodine             I  

 

Important Questions on Element, Compound and Mixture

MEDIUM
6th West Bengal Board
IMPORTANT
Write the names of solute and solvent of the solutions mentioned below:
Solution Solute Solvent
Syrup of sugar    
Salt solution    

 

MEDIUM
6th West Bengal Board
IMPORTANT

Examples of some known solutions are given below. Discuss among yourselves and write the name of the compounds of such solutions.

Solutions Components
Salt solution  
Sugar solution  
Lime water  
Air  

 

HARD
6th West Bengal Board
IMPORTANT

Take a little muddy water. Fold a circular filter paper into four folds as shown in the picture. Open one fold and put the cone-shaped paper in a funnel, use a few drops of water to set it properly. Then pour muddy water slowly with the help of a glass rod on the filter paper.

Question Image

Write in the following table what you see after a few minutes:

What you see Why do you think it happens?
   

 

HARD
6th West Bengal Board
IMPORTANT
Complete the following table.
Which solution Size of a solid particle, smaller or greater than that of the pores of the filter paper Which process- simple distillation or filtration - can be used for separation
Muddy water    
Saline water    

 

HARD
6th West Bengal Board
IMPORTANT

Take a mixture of salt and iron powder on a sheet of paper. Take out of the magnet from the back of a damaged speaker of a radio. Then hold a magnet near it and see what happens.

                 What you see               Where else can you use it?