1.

1). 37.5 hours2). 34.5 ​hours3). 38 ​hours4). 40 ​hours

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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