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  1. The hardest substance amongst the following is
  2. Copper pyrite, the chief ore of copper, is
  3. The bond dissociation energies of H₂, Cl₂ and HCl are 104, 58, and 103
  4. What is the value of electron gain enthalpy of Na+ if IE₁ of Na =5.1 eV ?
  5. If in a container no mass and no heat exchange occurs then it constitutes a