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Q.

Which of the following is the name of the compound used for softening of hard water?


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a

Washing soda

b

Baking soda

c

Baking powder

d

Plaster of Paris  

answer is A.

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Detailed Solution

Washing soda is the name of the compound used for softening of hard water.
Washing soda is a carbonic acid salt, and it is chemically known as sodium carbonate with the chemical formula [Na2CO3.10H2O]. Washing soda is used for making detergent used in homemade laundry. Washing soda is used for softening hard water, and in some laundry, it is used as an additive to soften water. As hard water is unfit for laundry purposes, it becomes necessary to convert hard water to soft water, so washing soda is used for softening water.
  
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