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प्रश्न
The hardness of 75,000 litres of a.water sample was completely removed by a permutit. The exhausted permutit then required 1500L of NaCl containing 117 mg of NaCl per litre for regeneration Calculate the hardness of water sample.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
