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Which source of water is free from hardness and surface impurities?

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in Engineering Chemistry II by (789k points)
Which source of water is free from hardness and surface impurities?

(a) Surface water

(b) Underground water

(c) Rain water

(d) Sea water

I got this question by my college professor while I was bunking the class.

I need to ask this question from Alkalinity of Water and its Estimation topic in portion Water and its Treatment of Engineering Chemistry II

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The correct option is (c) Rain water

To elaborate: Rain water is free from hardness and surface impurities. Surface water and sea water is very impure and saline.

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