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Permanent hardness of water may be removed by the addition of
1 Alum
2 Sodium carbonate
3 Lime
4 Potassium permanganate
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Answer / jayant agarwal
1. Alum
Is the answer as permanent hardness can be removed only by sulphate or chloride compounds.
| Is This Answer Correct ? | 11 Yes | 3 No |
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