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The final hardness of the water after treating by the hot lime soda process is about __________

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The final hardness of the water after treating by the hot lime soda process is about __________

(a) 10-15ppm

(b) 15-20ppm

(c) 20-25ppm

(d) 25-30ppm

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Question is from Lime Washing Soda Method topic in chapter Water of Applied Chemistry

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The correct choice is (c) 20-25ppm

The best I can explain: The final hardness of the water after treating by the hot lime soda process is about the 20-25ppm. In very less time the water is treated in this method.

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