MEDIUM
7th CBSE
IMPORTANT
Earn 100
State any two conditions necessary for the rusting of iron.
Important Questions on Physical and Chemical Changes
MEDIUM
7th CBSE
IMPORTANT
Why is melting of ice to form water considered a physical change?
EASY
7th CBSE
IMPORTANT
What are the characteristics of physical changes?
EASY
7th CBSE
IMPORTANT
What are the characteristics of chemical changes?
EASY
7th CBSE
IMPORTANT
What happens when magnesium oxide is dissolved in water?.
EASY
7th CBSE
IMPORTANT
Does the change in chemical properties take place during a chemical change?
MEDIUM
7th CBSE
IMPORTANT
Ram and Raheem are best friends. Raheem goes to Ram's house to celebrate Diwali. Both are bursting crackers. Suddenly, a spark falls on Raheem's arm. Ram immediately washes Raheem's hand and applies a cream for burns.
(a) Which type of change is bursting of crackers?
(b) Do you think, bursting crackers is good for our environment?
(c) Which value is shown by Ram here?
MEDIUM
7th CBSE
IMPORTANT
Give the differences between physical and chemical changes.
MEDIUM
7th CBSE
IMPORTANT
How are crystals of copper sulphate prepared?
