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Gun powder uses

A. Sulphur

B. Charcoal

C. Potassium nitrate

D. All (A), (B), & (C)

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

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  19. Permanent hardness of water can be removed by
  20. The main component of Pyrex glass is
  21. Pick out the wrong statement.
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  23. Pick out the wrong statement.
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