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SAI International School

Class – VIII

Subject – Chemistry

Topic – SYNTHETIC FIBRES AND PLASTICS

Sub-Topic – Synthetic Fibres (Rayon, Nylon, Polyester and Acrylic)

PRACTICE WORKSHEET

Q. No. Questions
Choose the correct option from the following for Questions 1, 2 and 3:
a) If both Assertion and Reason are correct and Reason is the correct explanation
of Assertion.
b) If both Assertion and Reason are correct, but Reason is not the correct
explanation of Assertion.
c) If Assertion is correct but Reason is incorrect.
d) If Assertion is incorrect but Reason is correct.
e) If Assertion & Reason both are incorrect.
1. Assertion (A): Polyester is synthesised from petrochemicals by linking amide units.
Reason (R):Polyester is a synthetic fibre.
2. Assertion (A): Rayon is a semi-synthetic fibre.
Reason (R):Cellulose is a naturally occurring polymer.
3. Assertion (A):Solution of Sulphur dioxide and water turns blue litmus paper to red.
Reason (R):Oxides of non-metals are acidic.
4. Which of the following materials is the best for making garments and jackets that can
be used in wet or damp environment?
a) Polyester
b) Wool
c) Cotton
d) Both (a) and (c)
5. Match column I with column II and select the correct answer from the givenoptions:
Column I Column II
P. A synthetic fibre also called as artificial silk (i) Spandex
Q. A synthetic fibre also known as Lycra (ii) Nylon
R. A synthetic fibre that closely resembles wool (iii) Rayon
S. The first true synthetic fibre (iv) Acrylic
a) P - (iv), Q - (ii), R - (iii), S - (i)
b) P - (iii), Q - (i), R - (ii), S - (iv)
c) P - (ii), Q - (iii), R - (i), S - (iv)
d) P - (iii), Q - (i), R - (iv), S - (ii)
6. Explain why aluminium foils are used to wrap food items?
7. Rayon is known as semi-synthetic fibre. Justify the statement with explanation.
8. a) Define ‘Polymerisation’.
b) Give on each example of natural and synthetic polymers.

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