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  1. If in a container no mass and no heat exchange occurs then it constitutes a
  2. Standard entropies of X₂, Y₂ and XY₃ are 60, 40 and 50 J K⁻¹ mol⁻¹ respectively.
  3. If Na is heated in presence of air, it forms
  4. The element, with atomic number 118, will be
  5. Phenylethyl ether when boiled with concentrated HBr gives