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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2026 · Paper I, General Studies · Q67 of 120

Geo-Scientist Prelims 2026 General Studies Q67: Which of the following methods can be used for removing permanent…

QuestionChemistry / Hardness of water

Which of the following methods can be used for removing permanent hardness of water?

  1. Treatment with washing soda
  2. By ion exchange method
  3. By addition of lime

Select the correct answer using the code given below.

  1. (a) I and II
  2. (b) II only
  3. (c) I and III
  4. (d) I only

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