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  1. A helium, molecule is two times heavier than a hydrogen molecule at 298 K
  2. The recycling of plastic is done by
  3. A deutrium is
  4. In N₂ + 3H₂ → 2NH₃ reversible reaction ,increases in pressure will favour
  5. The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is