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  1. The method of zone refining of metals is based on the principle of
  2. In Ramsay and Rayleigh’s isolation on noble gases from air,the nitrogen of the
  3. Benzaldehyde condenses with N,N-dimethylaniline in presence of anhydrous ZnCl₂
  4. The solubility of CuBr is 2 ˣ 10⁻⁴ mol/L at 25⁰C. The Ksp value for CuBr is
  5. The energy of second Bhor orbit of the hydrogen atom is -328 kJ mol⁻¹, hence the enregy