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231

Q:

Sodium carbonate is used ______.

  • 1
    To make drinking water free from germs
  • 2
    to remove the permanent hardness of water
  • 3
    for bleaching cotton and linen in the textile industry
  • 4
    as an oxidising agent in many chemical industries
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Answer : 2. "to remove the permanent hardness of water"
Explanation :

It is commonly known as Na2CO3 or sodium carbonate. It is used in the softening of hard water i.e. it is used to remove the temporary and permanent hardness of the water. It is commonly used as a cleaning agent for domestic purposes. It is also used in the manufacturing of paper, soap, textiles, paints, etc.

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