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Chemical name of 'alum' is

A. Barium sulphate

B. Aluminium sulphate

C. Aluminium chloride

D. Calcium sulphate

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  19. Massecuite is
  20. Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used
  21. Caprolactam (a raw material for nylon-6 manufacture) is produced from
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