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What is meant by hardness of water? How ...

What is meant by hardness of water? How many types are there?

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Knowledge Check

  • Permanent hardness of water is due to

    A
    Chlorides of Ca and Mg
    B
    Sulphates of Ca and Mg
    C
    Chlorides and sulphates of Ca and Mg
    D
    Bicarbonates of Ca and Mg

  • Temporary hardness of water can be removed

    A
    By boiling
    B
    By freezing
    C
    By the addition of NaCl
    D
    By the addition of `Na_2SO_4`

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