Question: Permanent hardness of water may be removed by the addition of:
(a) Alum
(b) Sodium carbonate
(c) Lime
(d) Potassium permanganate
Answer: (b) Sodium carbonate
Question: Permanent hardness of water may be removed by the addition of:
(a) Alum
(b) Sodium carbonate
(c) Lime
(d) Potassium permanganate
Answer: (b) Sodium carbonate
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