Question

Rajesh observe structure and flame test of three fibre (X, Y, Z) and tabulised the following data.
Fibre
Structure
Flame
Ash
Fibre-X Short, uneven Vigorous large
flame Little ash& beady residue
Fibre-Y Short, uneven Poorly without flame
Grey ball
Fibre-Z Long, straight Melts & burn with difficulty Shrinks & form body residue
From above observation which statement is correct?
(A) All three fibres are natural fibre
(B) Fibre (x) and (Z) is synthetic fibre
(C) Fibre (Y) and (Z) are natural fibre and (X) is synthetic
(D) Fibre (X) & (Y) is natural but fibre (Z) is synthetic fibre​

Answer 1

thanks for free point...

Answer 2

Answer:

(i) cotton fibre - Cellulosic fibers (cotton, linen and rayon) burn rapidly with a yellow flame. When the flame is removed, there is an afterglow, then soft gray ash. Cotton: Ignites on contact with flames; burns quickly and leaves a yellowish to orange afterglow when put out.

synthetic fire- Most synthetic fibers both burn and melt, and also tend to shrink away from the flame. Synthetics burn with an acrid, chemical or vinegar-like odor and leave a plastic bead. Acrylic: Flames and burns rapidly with hot, sputtering flame and a black smoke. Nylon: It will shrink from the flame and burn slowly.

Explanation: