Which of the following is a hard substance?

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Cotton

Mirror

Sponge

Iron

answer is C.

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Detailed Solution

Those materials which cannot be easily compressed cut, moulded or scratched are called hard materials. Iron is a hard substance because it cannot be easily compressed.

Cotton, sponge or mirror are substances that can be easily compressed, cut, moulded or scratched by an external force. Therefore, they are soft materials.

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