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  1. One of the following metals is obtained by leaching its ore with
  2. A certain mass of gas occupies a volume of 300 c.c. at 27⁰C and 620 mm pressure
  3. The weight of one molecule of a compound C₆₀H₁₂₂ is
  4. p-type silicon is formed by adding a minute amount of an element with
  5. The normality of 10 volume hydrogen peroxide is