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Assertion (A) Permanent hardness of w...

Assertion (A) Permanent hardness of water is removed by treatment with washing soda.
Reson (R) Washing soda reacts with soluble magnesium and calcium sulphate to from insolube carbonates.

Text Solution

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The correct Answer is:
A
Statements of assertion and reason both and reason is the correct explanation of assertion.
`Na_(2)CO_(3)+underset(CsSO_(4)" (from hard water)")underset("or")(MgSO_(4) to Na_(2)SO_(4)) + underset(CaCO_(3)"(insoluble)")underset("or")(MgCO_(3))`
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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.

    • Similar Questions

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    Give balanced equations to show how - Permanent hardness in water can be removed by addition of washing soda

    A : Permanent hardness of water is due to the presence of chlorine or sulphates of Ca or Mg. R : Permanent hardness is removed by boiling

    Assertion (A) : Temporary hardness in water is due to the presence of chlorides of magnesium. Reason (R) :Temporary hardness is removed by Clark's method.

    Assertion (A) : Temporary hardness in water is due to the presence of chlorides of magnesium. Reason (R) :Temporary hardness is removed by Clark's method.

    What will the concentration of [Ca^(+2)] in a sample of 1 litre hard water if after treatment with washing soda 10 g insoluable CaCO_(3) is precipitated.

    Assertion (A): Calcium and magnesium oxides are not reduced by carbon. Reason (R ): Calcium and magnesium oxides react with carbon to form their respected carbides.

    One litre hard water contains 12.00 mg Mg^(2+) millieqivalent of washing soda required to remove its hardness is

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