EASY
7th CBSE
IMPORTANT
Earn 100

What kind of change occurs when sugar is dissolved in water ? Why?

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Why are burning of wood and ripening of fruits considered as chemical changes ?
HARD
7th CBSE
IMPORTANT
Respiration is a kind of chemical change. How?
EASY
7th CBSE
IMPORTANT
What are the methods to prevent rusting of iron articles?
HARD
7th CBSE
IMPORTANT
Why does soaking cut vegetables in water prevent their browning?
HARD
7th CBSE
IMPORTANT
Describe physical change with the help of examples.
MEDIUM
7th CBSE
IMPORTANT
What are the indications of a chemical reaction taking place?
HARD
7th CBSE
IMPORTANT
Addition of water to salt or sand is a physical change whereas to cement is a chemical change. Justify the statement.