MEDIUM
7th CBSE
IMPORTANT
Earn 100

Rust is a mixture and does not have a chemical formula. True of false?

50% studentsanswered this correctly

Important Questions on Physical and Chemical Changes

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.
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
If an equation has '+ heat' written on its right-hand side, what type of reaction is it? (exothermic / endothermic)
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B
Identify what kind of reaction the following reaction is:
X+Y→ XY
(Double displacement/ Decomposition/ Combination)
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B

Identify what kind of reaction each of the following is:

   XY →   X + Y

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 8 - Physical and Chemical Changes>EXERCISES>Q B

Identify what kind of reaction each of the following is:
AB+XY→  AY+XB 

(Combination reaction / Double displacement reaction / Single displacement reaction).