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  1. A certain current liberated 0.504 g of hydrogen in 2 hours. How many grams
  2. Which of the following technique is most suitable for purification of cyclo
  3. Calculate the energy in joule corresponding to light of wavelength 45nm
  4. The hybridised state of N in R₂NH is
  5. Which of the following elements will have the lowest first ionisation energy?