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The cause of permanent hardness of water is due to …… (a) Ca(HCO3)2 (b) Mg(HCO3k)2 (c) CaCl2 (d) MgCO3

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The cause of permanent hardness of water is due to ……

(a) Ca(HCO3)2 

(b) Mg(HCO3k)2 

(c) CaCl2 

(d) MgCO3

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(c) CaCl2

Permanent hardness if water is due to the presence of the chlorides, nitrates and sulphates of Ca2+ and Mg2+ ions.

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