A red fabric swatch has the following characteristics: Surface of fibers appears

Question

A red fabric swatch has the following characteristics: Surface of fibers appears scaly under the microscope Bums to a char with a disagreeable odor Not affected by contact with acetone Destroyed by contact with strong acid and strong base Birefringent Kendal analysis reveals the presence of nitrogen A brightly dyed piece of a necktie has the following characteristics: Surface of fibers appears smooth under the microscope Bums to a char Not affected by contact with acetone Destroyed by contact with strong add and strong base Birefringent Kendal analysis reveals the presence of nitrogen

Explanation / Answer

a) the fibre contains nitrogen as it gives Kjeldahl's test.

It burns with smell

It is unaffected by acetone and is affected by acid and base

The surface is scaly under microsocpe

so answer is : NYLON

b)

the fibre contains nitrogen as it gives Kjeldahl's test.

It burns with smell

It is unaffected by acetone and is affected by acid and base

The surface is smotth under microsocpe

So fibre is silk.

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