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Assertion: Permanent hardness of water ...

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

A

Assertion and reason both are correct statements and reason is correct explanation for assertion.

B

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C

Assertion is correct statement but reason wrong statement.

D

Assertion is wrong statement but reason is correct statement.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the assertion and reason about the treatment of permanent hardness of water with washing soda, we can follow these steps: ### Step 1: Understand the Assertion The assertion states that "Permanent hardness of water can be removed by treatment with washing soda." **Solution:** This statement is true. Permanent hardness in water is primarily due to the presence of dissolved calcium and magnesium salts, such as calcium sulfate (CaSO₄) and magnesium sulfate (MgSO₄). Washing soda, which is sodium carbonate (Na₂CO₃), can react with these salts to remove hardness. ### Step 2: Understand the Reason The reason states that "Washing soda reacts with calcium and magnesium sulfates and chlorides to form insoluble carbonates." **Solution:** This statement is also true. When washing soda is added to hard water, it reacts with the calcium and magnesium ions present in the water. The reactions can be summarized as follows: - Calcium ions react with carbonate ions to form calcium carbonate (CaCO₃), which is insoluble in water. - Magnesium ions react with carbonate ions to form magnesium carbonate (MgCO₃), which is also insoluble. ### Step 3: Evaluate the Relationship Now we need to determine if the reason provided is a correct explanation of the assertion. **Solution:** Since washing soda indeed reacts with the calcium and magnesium ions to form insoluble carbonates, this reaction is the mechanism by which washing soda removes the permanent hardness of water. Therefore, the reason correctly explains the assertion. ### Conclusion Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. **Final Answer:** The correct option is A: Both assertion and reason are correct, and the reason is the correct explanation of the assertion. ---
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In the following quesitons a statement of Assertion (A) followed by a statement of reason (R ) is given. Choose the correct option out of the option given below each question. Assertion[A]: Permanent hardness of water is removed by treatment with washin soda. Reason[R]: Washing soda reacts with soluble magneisum and calcium sulphate to form insoluble carbonates.

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 carbonates.

Knowledge Check

  • 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.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Assertion (A) : Last traces of moisture in EtOH can be removed by putting sodium wires in it. Reason (R) : Sodium reacts with water to produce H_(2) .

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true and R is not a correct explanation of A.
    C
    A is true but R is false.
    D
    A is false but R is true.

  • Assertion (A): Boiling removes both temporary and permanent hardness from water. Reason (R ): Bicarbonates of calcium and magnesium undergoes decomposition on heating

    A
    Both (A) and (R ) are true and (R ) is the correct reason for (A).
    B
    Both (A) and (R ) are true but (R ) is not the correct reason for (A)
    C
    (A) is true but (R ) is false
    D
    (A) is false but (R ) is true.

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