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KPSC KAS 2017 · Question 173 of 200

Consider the following statements about the hardness of water : A. Temporary hardness is caused by the presence of dissolved calcium bicarbonate and magnesium bicarbonate. B. Permanent hardness is caused by the presence of dissolved calcium sulphate/calcium chloride and/or magnesium sulphate/magnesium chloride. C. One of the methods of removing permanent hardness is boiling the hard water. Which of the above statements is/are correct ? Select the code for the correct answer from the options given below :

General Science

  1. AA only
  2. BA and B onlyCorrect
  3. CB and C only
  4. DA, B and C

Answer: B. A and B only

Explanation

Temporary hardness comes from calcium/magnesium bicarbonates and permanent hardness from their sulphates/chlorides; boiling removes only temporary hardness — A and B are correct.

Source: KPSC Gazetted Probationers Prelims 2017, Paper-II (General Studies, subject code 262), Series A

← Q172View full paper (200 questions)Q174 →

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