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.
Chalk: Hard, rough, non-lustrous
Wood: Hard, rough, non-lustrous
Aluminium: Hard, smooth, lustrous
Candle: Hard, smooth, non-lustrous
Cotton: Soft, smooth, non-lustrous
Iron nail: Hard, smooth, lustrous
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