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Question

A blacksmith grinds edges of iron axe against a spinning wheel to sharpen it. Sparks of fire and heat are generated. We can conclude that -

A
It is chemical change as heat is generated
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B
It is physical change as only shape of axe changes
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C
Its physical change as iron turns into new metal
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D
It involves both physical and chemical changes
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Solution

The correct option is B It is physical change as only shape of axe changes
Physical changes are the changes in which only shapes of substance changes. There is no change in chemical composition in the physical changes. By grinding iron does not change it into any other metal or any other substance is not formed.
By grinding the edges of iron axe against a spinning wheel only the shape of the axe is changing. Hence it is a physical change.

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