Question

how can you distinguish between the cotton and silk on the basis of their of the burning properties of these fabrics

Answer 1

Cotton fabric ignited fast and burns quickly, smells like burning paper Silk fabric is slow to ignite and will not stay lit for long tends to smoulder, smells like burning hair. 

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Answer 2

Cotton is a natural fibre it take time to catch fire and silk is an artificial fibre it catches fire easily