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P half column> **Lecture -1** By [[https://orgsyn.in/raman|Dr. Raman Singh]] <html><iframe width="560... er; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> <script src="... Unit of Hardness - Disadvantages of hard water in domestic and industrial uses - Characteristics of drinking or potable water **Questions for Assi