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  1. Which of the following materials is used in high temperature thermometers
  2. The oxidation state of chlorine in HClO₄ is
  3. Which one of the following is not an amphoteric substance
  4. If KMnO₄ is reduced by oxalic caid, in an acidic medium, then oxidation number of Mn changes from
  5. Calculate the amount of [Ca(OH)₂] required to remove the hardness of water