EASY
6th ICSE
IMPORTANT
Earn 100

Air is a heterogeneous mixture.

50% studentsanswered this correctly

Important Questions on Elements, Compounds and Mixtures

EASY
6th ICSE
IMPORTANT

Complete the following table the first one is done.

Formula of compounds Elements present in the compound
CO2 Carbon and Oxygen
CaO  
PbO  
PbS  
CuS  
FeS  

 

EASY
6th ICSE
IMPORTANT

Complete the following table:

Compound

Formula Number of elements Names of elements
Copper sulphate CuSO4 3 Copper, sulphur, oxygen
Zinc sulphide ZnS    
Ammonia NH3    
Sulphuric acid H2SO4    
Hydrochloric acid HCl    
Table salt NaCl    

 

MEDIUM
6th ICSE
IMPORTANT

Complete the following table:

Substance Element, compound or mixture Why do you think so?
Gold Element It is made of one kind of atom
Diamond    
Carbon dioxide    
Air    
Sea water    
Pure water    
Iron    
Ammonia    
Soda water    
Table salt (NaCl)    

 

EASY
6th ICSE
IMPORTANT
What does a chemical formula represent?
EASY
6th ICSE
IMPORTANT
Are metalloids a mixture of metals and non-metals?
EASY
6th ICSE
IMPORTANT
How many atoms are there in polyatomic molecules?
EASY
6th ICSE
IMPORTANT
What does nucleus of an atom contain?