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1). 37.5 hours2). 34.5 hours3). 38 hours4). 40 hours |
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Answer» TOTAL salt present in 1 kg of 5% solution = 5 × 1000/100 = 50gm. Saturation LIMIT of salt is 200gm per Litre. ∴ AMOUNT of WATER required to dissolve 50gm of salts = 50 × 1000/200 = 250ml. Rate of evaporation = 20gm/ hour. ∴ Amount to be evaporated for sedimenting = 1000 - 250 = 750GM. Time taken to evaporate 750gm = 750/20 = 37.5 hours. ∴ After 37.5 Hours sedimentation will start. |
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