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  1. Which of the following solutions boils at the highest temperature
  2. The cell membranes are mainly composed of
  3. The energy of second Bhor orbit of the hydrogen atom is -328 kJ mol⁻¹, hence the enregy
  4. If the pH of a solution is 4, then its OH⁻ concentration is
  5. The variation of the boiling points of the hydrogen halides is in the order