The compound used to remove the permanent hardness of water is

NaOH

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N a_{2} C O_{3} .10 H_{2} O

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C a O C l_{2}

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M g (O H)_{2}

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Solution

The correct option is B $N a_{2} C O_{3} .10 H_{2} O$
Washing soda i.e. $N a_{2} C O_{3} \cdot 10 H_{2} O$ is used for removing the permanent hardness of water. It reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.

Hence, the correct answer is option (b).

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Q. The Permanent hardness of water is due to compound

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whereas the temporary hardness of water is due to compound

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When washing soda is added to remove the permanent hardness of water it converts sulphates and chlorides into which of the following insoluble compound-

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The compound used to remove the permanent hardness of water is

The correct option is B Na2CO3.10H2OWashing soda i.e. Na2CO3⋅10H2O is used for removing the permanent hardness of water. It reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates. Hence, the correct answer is option (b).