HARD
7th CBSE
IMPORTANT
Earn 100

Which gas is evolved when zinc reacts with dilute hydrochloric acid?

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Important Questions on Physical and Chemical Changes

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 _____
MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q B
Burning of a substance is a chemical change _____
EASY
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q B
Stretching a spring is a chemical change. _____
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q B
On mixing magnesium oxide with water, a new substance called magnesium chloride is formed.
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)