In permanent hardness of water, when washing soda is treated with water, calcium carbonate is precipitated out.

True

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False

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Solution

The correct option is A True
Permanent hardness of water is due to presence of soluble chlorides and sulphates of $M g^{2 +}$ and $C a^{2 +}$ .
The permanent hardness of water due to calcium ions is removed by washing soda. This method is not applicable to permanent hardness of water due to magnesium salts.
$C a S O_{4} + N a_{2} C O_{3} ⇌ C a C O_{3} ↓ + N a_{2} S O_{4}$

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Similar questions

Q. In permanent hardness of water, when washing soda is treated with water, ________ is precipitated out.

Q. Assertion :Permanent hardness of water can be removed by using washing soda Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates

Q. Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason(R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble compounds.

Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason(R): Washing soda reacts with soluble magnesium and calcium sulphate to form water-soluble compounds.

Q. Boiling hard water with washing soda removes permanent hardness.

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