MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryHydrogenHardness of Water
Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
Answer
C
Explanation
Sodium hexametaphosphate, 3 6 18 Na P O , commercially called „Calgon‟ is added to hard water for water softening.
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