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Q: The objective of lime-soda softening process is :
  • A. to carbobnise water
  • B. to remove hardness by forming an insoluble precipitate
  • C. to enhance biochemical reactions
  • D. to add taste to waste
Correct Answer: Option B - Lime soda is a process used in the water treatment to remove hardness from water. This process is now obsolete but was very useful for the treatment of large volumes of hard water. Addition of lime (CaO) and soda (Na2CO3) to the hard water precipitates Calcium as the carbonate, and magnesium as its hydroxide.
B. Lime soda is a process used in the water treatment to remove hardness from water. This process is now obsolete but was very useful for the treatment of large volumes of hard water. Addition of lime (CaO) and soda (Na2CO3) to the hard water precipitates Calcium as the carbonate, and magnesium as its hydroxide.

Explanations:

Lime soda is a process used in the water treatment to remove hardness from water. This process is now obsolete but was very useful for the treatment of large volumes of hard water. Addition of lime (CaO) and soda (Na2CO3) to the hard water precipitates Calcium as the carbonate, and magnesium as its hydroxide.