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  1. The absorption of hydrogen by palladium is called
  2. Which of the following organic compounds polymerizes to form the polyester Dacron
  3. The ionisation potential for hydrogen atom is 13.6eV, the ionization potential for He⁺
  4. Because of lanthanoid contraction,which of the following pairs of elements
  5. Empirical formula of a compound is CH₂O.If its molecular weight is 180,