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  1. Ortho and para-hydrogen have
  2. The de-Broglie wavelength associated with a ball of mass 1kg having kinetic energy
  3. The rate constant of the reaction A → B is 0.6 ˣ 10⁻³ mol per second.
  4. In the extraction of copper from its sulphide ore, the metal is finally obtained
  5. In a period, the elements are arranged in strict sequence of