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SSC Selection Post 2022 PYQ — Question 37

SSC Selection Post - Matriculation Level - 3 Feb 2022 - Shift 3 • General Awareness • Q37

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______ is used to remove the temporary and permanent hardness of water.

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Correct answer: A

Explanation

The correct answer is Option 1 i.e. Sodium carbonate.

  • Washing soda (sodium carbonate, Na2CO3) is used to remove both temporary and permanent hardness of water. 
  • It's a white, crystalline solid and is also known as soda ash or soda crystals.
  • It works by reacting with the calcium and magnesium ions that cause hardness, forming insoluble precipitates that can be removed from the water. 
  • While washing soda is effective, other methods for removing permanent hardness include the ion exchange method.