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Q 1.     Classify the following as chemical or physical changes:

         • cutting of trees,

        • melting of butter in a pan,

        • rusting of almirah,

        • boiling of water to form steam,

        • passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,

        • dissolving common salt in water,

        • making a fruit salad with raw fruits, and

        • burning of paper and wood

Answers (1)

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Physical changes-

cutting of trees
melting of butter in a pan
boiling of water to form steam
dissolving common salt in water
making a fruit salad with raw fruits

Chemical changes-

rusting of almirah,
passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,
burning of paper and wood

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