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Molecular weight of plastics ranges from

A. 5000 to 10000

B. 20000 to 250000

C. 500 to 5000

D. 106 to 109

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  20. Grignard reagent is chemically known as
  21. Major component of flint glass is
  22. Which glass is usually used in optical work?
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