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Physical and Chemical changes

Which of the ...

Question

Which of the following are physical changes and which are chemical changes?

(a) Burning of a magnesium wire

(b) Freezing of water

(c) Rusting of iron

(d) Glowing of an electric bulb

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Solution

(a) Burning of magnesium wire :– Chemical change

(b) Freezing of water :– Physical change

(c) Rusting of iron :– Chemical change

(d) Glowing of electric bulb :– Physical change

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Similar questions

Which of the following are chemical changes?

(a) Growth of a plant

(b) Rusting of iron

(d) Cooking of food

(e) Digestion of food

(f) Freezing of water

(g) Burning of candle

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Give reason:

(a)Freezing of water to ice and evaporation of water are physical changes.

(b)Burning of a candle is both a physical and a chemical change.

(c)Burning of paper is a chemical change.

(d)Cutting of a cloth piece is a physical change, though it cannot be reversed.

Question 1

Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax

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