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The chemical formula of Glauber’s salt, used in the Kraft process, is

  1. $Na_{2}CO_{3}.10H_{2}O$
  2. $Na_{2}S_{2}O_{4}.2H_{2}O$
  3. $Na_{2}HPO_{4}.2H_{2}O$
  4. $Na_{2}SO_{4}.10H_{2}O$
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