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  1. One of the following metals is obtained by leaching its ore with
  2. Standard enthalpy of vaporisation Δvap H⁰ for water at 100⁰C is 40.66 kJ mol⁻¹.
  3. The rate constant of the reaction A → B is 0.6 ˣ 10⁻³ mol per second.
  4. The weight of iron which will be converted into its oxide(Fe₃O₄) by the action of 18g
  5. Which of the following ions can cause coagulation of proteins