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Chemistry

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21. Periodic table was given by
 
  • A. Faraday
  • B. Lavoisier
  • C. Arrhenius
  • D. Mendeleef
 
22. Bauxite is an ore of
 
  • A. copper
  • B. zinc
  • C. aluminium
  • D. iron
 
 
23. Aluminium oxide is a/an
 
  • A. basic oxide
  • B. acidic oxide
  • C. neutral acid
  • D. amphoteric acid
 
24. Ruby is an oxide of
 
  • A. silver
  • B. gold
  • C. platinum
  • D. aluminium
 
25. Tobacco is preserved from drying out in
 
  • A. acetone
  • B. glycol
  • C. ethanol
  • D. glycerol