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  1. By which of the following processes permanent hardness of water can be removed
  2. Rutherford’s experiment led to the discovery of
  3. A certain mass of gas occupies a volume of 300 c.c. at 27⁰C and 620 mm pressure
  4. One mole of magnesium nitride on reaction with excess of water gives
  5. In which of the following reaction, the hydrogen peroxide is a reducing agent?