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  1. Helium is used in balloons in place of hydrogen because it is
  2. A neutral fertilizer among these compounds is
  3. At 25⁰C, the dissociation constant of a base, BOH, is 1.0 ˣ 10⁻¹².
  4. In Duma’s method for estimation of nitrogen, 0.25g of an organic compound
  5. Which has highest pH