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The chemical used as a fixer in photography is ?

  • sodium thiosulphate
  • sodium sulphate
  • borax
  • ammonium sulphate
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1. Contact lenses are made from ?

  • Polyvinyl chloride
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2. The most malleable metal is

  • platinum
  • silver
  • gold
  • iron

3. The cyclotron is used to

  • accelerating particles
  • separating elements
  • purifying metals
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4. All noble gases are ?

  • colourless
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  • colourless and odourless
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  • hydrolysis
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