In the manufacture of polythene by the Ziegler process using ethylene,the temperature for proper polymerisation required is
- ABelow $10\,^oC$
- B$10\,^oC$ to $50\,^oC$
- C$50\,^oC$ to $80\,^oC$
- D$80\,^oC$ to $140\,^oC$
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