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  1. The role of cryolite in the metallurgy of extraction of aluminium is to
  2. Which one of the following is a false statement
  3. Enthalpy of CH₄ + ¹/² O₂ → CH₃OH is negative. If enthalpy of combustion of CH₄
  4. In a lime kiln, to get higher yield of CO₂, the measure that can be taken is
  5. The pH of solution containing 0.10 M sodium acetate and 0.03 M acetic acid is