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  1. On heating which of the following releases CO₂ most easily
  2. Cassiterite is concentrated by
  3. The amphoteric oxide is
  4. If 300 mL of a gas at 27⁰ C is cooled to 7⁰C at constant pressure, its final volume
  5. The equilibrium weight of MnSO₄ is M/2 when it changes into