Permanent hardness of water is due to the dissolved chlorides and sulphates of
a) Na and Mg b) Ca and Fec) Ca and Mg d) Na and Mn
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a) Na and Mg. Permanent hardness in water is hardness due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium.
They will not be precipitated by boiling.
It mainly have the lime scale to build up on the inside pipe restricting with flow of water as well as causing a blockage.
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