MEDIUM
7th CBSE
IMPORTANT
Earn 100

An oxidation reaction involves addition of

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Important Questions on Physical and Chemical Changes

HARD
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q A
In which of the following reaction is there only one reactant?
HARD
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q A
If A is more reactive than B, which of the following is true?
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
In which changes do substances undergo chemical transformation-physical or chemical?
 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
Rust is a mixture and does not have a chemical formula. True of false?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
The process of depositing zinc on iron to prevent rusting is called _____.
 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
Write the name of the gas given off when calcium carbonate is heated? (Oxygen/ Hydrogen/ Carbon dioxide)
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
When two soluble substances in solution react to give an insoluble substance, a _____ is formed.
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
Heat is absorbed in an _____ reaction.