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Question
Which of the following is a biodegradable substance?
(A)DOT
(B) Telton (C) leftover food
14) Which of the following groups contains all synthetic substances,
(A) Nylon, Terylene, wool (B) cotton, polycot, Rayon
(C) PVC, polythene. Bakelite (D) Acrylic, silk wool
Aluminum
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