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GATE 2022 CH – Question 19

Chemical Technology · Natural products industries: pulp and paper, sugar and ethanol · 1 mark · Multiple choice

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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Show answer and explanation

Correct answer: (D) Na$_2$SO$_4$.10H$_2$O

Explanation

Glauber's salt is sodium sulphate decahydrate, Na₂SO₄·10H₂O. Its anhydrous form (salt cake) is the make-up chemical of the Kraft process.