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  1. A hydrocarbon contains 20% hydrogen and 80% carbon.The empirical formula is
  2. For a spontaneous process, entropy always
  3. The sum of coordination number and oxidation number of the metal M in the complex
  4. A solution with pH = 2 is more acidic then one with a pH = 6 , by a factor
  5. The oxidation states of Mn in MnSO₄,MnO₂,K₂MnO₄ and KMnO₄ are respectively