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SSC CGL 2020 PYQ — Question 48

SSC CGL - 7 March 2020 Shift 2 • General Awareness • Q48

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Which of the following is used for removing the permanent hardness of water?

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Correct answer: B

Explanation

The correct answer is option 2 i.e Washing soda.

  • Washing soda:

  1. It is used for removing the permanent hardness of the water. 

  2. The hardness in water can be caused by the presence of chlorides, nitrates, and sulphates of calcium and magnesium.

  3. These do not precipitate by boiling water. Hence, Washing Soda is used.

  4. Washing Soda is known as Sodium Carbonate.

  5. The formula for washing soda can be given as Na2CO3.