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Question

Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties by which we can prove that these materials are different.

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Answer

The given materials can be differentiated on the basis of lustre, hardness, softness,  roughness or smoothness.

LustreHardness SoftnessRoughnessSmoothness
Chalk
Iron nail
Wood
Aluminium
Candle
Cotton

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