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  1. A sp³ – hybrid orbital contains
  2. Urea is preferred to ammonium sulphate as a nitrogeneous fertilizer because
  3. 100 mL of HCl + 35 mL of NaOH, colour of methyl orange in the solution will be
  4. The number of moles of acidified KMnO₄ required to oxidise one mole
  5. In which of the following conditions a chemical reaction can not occur