HARD
7th CBSE
IMPORTANT
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On mixing magnesium oxide with water, a new substance called magnesium chloride is formed.

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Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q B
On mixing baking soda with vinegar, hydrogen gas is produced.
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q C
Write the name of the metal which burns with a dazzling white flame. (Magnesium/ Sodium/ Copper)
EASY
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q C
Name a method which can prevent rusting.
EASY
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q C
Is inflating a balloon a physical or a chemical change?
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q C
Is magnesium hydroxide acidic or basic in nature? Why?
MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q C
Give examples where chemical changes are accompanied by change in smell.
EASY
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q D
Give two examples each of physical and chemical changes.
MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q D
What do you understand by ‘rust’? Represent the chemical change that occurs during rusting.