EASY
7th CBSE
IMPORTANT
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The chemical formula of rust is .

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Important Questions on Physical And Chemical Changes

EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 9

_____ is the process of depositing a layer of zinc on iron to prevent the iron from rusting.

EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 10
Heat may be evolved or absorbed during a _____ change.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 11
_____ gas is given out when vinegar is added to baking soda.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 13
When magnesium is burnt, a new substance _____ is formed.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 15
The change in which a substance in a different state but having similar chemical properties is formed is a _____ change.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 1
The iron gate, if not painted, gets rusted due to the presence of air and moisture.
EASY
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 2
The process of separation of crystals from at saturated solution on cooling is called evaporation.
HARD
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 2 - Physical And Chemical Changes>EXERCISE>Q 3

Give three reasons why the melting of wax is considered a physical change while burning a candle is a chemical change.