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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

Question Posted / guest

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Permanent hardness of water may be removed by the addition of 1 Alum 2 Sodium carbonate 3 L..

Answer / guest

(2) Sodium carbonate

Is This Answer Correct ?    49 Yes 13 No

Permanent hardness of water may be removed by the addition of 1 Alum 2 Sodium carbonate 3 L..

Answer / souvik

lime

Is This Answer Correct ?    16 Yes 6 No

Permanent hardness of water may be removed by the addition of 1 Alum 2 Sodium carbonate 3 L..

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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