HARD
7th CBSE
IMPORTANT
Earn 100

Iron filings on heating with sulphur form iron . (sulphide/ sulphate)

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Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>Check Point 2>Q 3
Burning of petrol is a _____ change.
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>Check Point 2>Q 5
Crystals of a substance are obtained from its _____ solution. (unsaturated / supersaturated)
MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q A
Most chemical changes are
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q A
Magnesium hydroxide is
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q A
Which gas is evolved when zinc reacts with dilute hydrochloric acid?
EASY
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q A
Which of these is a chemical change?
MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q A
Which of these cannot prevent rusting of iron?
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q B
Alloying prevents rusting _____