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Question

The compound which is used for removing the permanent hardness of water is_______?


A

Na2CO3.10H2O

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B

NaHCO3

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C

Na2CO3

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D

CuSO4.5H2O

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Solution

The correct option is A

Na2CO3.10H2O


The explanation for the correct option:

Option(A):Na2CO3.10H2O

  • Permanent hardness is known as the hardness caused due to the presence of sulfates and chlorides of calcium and magnesium in water., which cannot be removed with simple boiling.
  • It is generally caused by the presence of calcium sulfate or magnesium sulfates in the water, which tends not to precipitate easily with the increased temperature.
  • However,Na2CO3.10H2O which is commonly known as washing soda mostly gets used for removing the permanent hardness of the water.

The explanation for the incorrect option:

Option(B):NaHCO3

  • NaHCO3is not generally used to remove the permanent hardness of the water.
  • thus, the given option is the incorrect one.

Option(C):Na2CO3

  • The compound Na2CO3, is not mostly used in removing the permanent hardness of the water.
  • Hence, the given option does not represent the correct concept.

Option(D):CuSO4.5H2O

  • CuSO4.5H2O is not generally used to remove the permanent hardness of the water.
  • Hence, the given option does not coincide with the correct concept.

Hence, the compound which is used for removing the permanent hardness of water is Na2CO3.10H2O , option (A) is the correct answer.


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