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  1. Mercurous chloride exists in the form of
  2. The hydrogen ion concentration in mol/dm, in a 0.2 M solution of a weak acid
  3. For the reaction , X₂O₄(l) → 2XO₂(g), ΔG is
  4. The pH value of 0.02 M ammonia solution, which is 5% ionised, will be
  5. Two chemicals having same chemical formula but different arrangement of atoms