_______ is used for softening of hard water.

Sodium sulfate

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Sodium carbonate

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Sodium oxide

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Sodium chloride

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Solution

The correct option is B
Sodium carbonate

The explanation for the correct option (B):
Washing soda is a white powder with no odor. It is also known as Sodium carbonate and has the chemical formula Na₂CO₃.
Sodium carbonate collects moisture from the air and is hygroscopic in nature.
It is very water-soluble and produces a strongly alkaline Water (H₂O) solution.
In water, Sodium carbonate binds Calcium (Ca²⁺) and Magnesium (Mg²⁺) ions, the ions responsible for hardness in Water. Adding Sodium carbonate to Water can soften it. Hence, it is used for removing the permanent hardness of the Water.
Final Answer: Hence, option (B) is correct. Sodium carbonate is used for softening of hard water.

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Name thesodium compound which is used for softening hard water.

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