The hardness of water sample containing 0.002 mole of magnesium sulphate dissolved in a litre is expressed as
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The hardness of water sample containing 0.002 mole of magnesium sulphate dissolved in a litre of water is expressed as (a) 20 ppm
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The hardness of water sample containing 0.002 mole of magnesium sulphate dissolved in a litre is expressed as 20 ppm
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