10th Class chemistry New Book|chap No 20|Water|Topic Useful and Harmful Substances in water

10th Class Chemistry (New Book) | Chapter 20 – Water Topic: Substances Present in Water Obtained from Natural Sources In this lecture, we will study the different substances naturally present in water obtained from rivers, lakes, ponds, rainwater, and underground sources. We will discuss dissolved salts, minerals, dissolved oxygen, carbon dioxide, microorganisms, nitrates, phosphates, and suspended impurities. We will also learn how these substances affect water quality, human health, and aquatic life. This lecture is explained in a simple and exam-oriented way with clear concepts and important MCQs for 10th Class Chemistry students. Topics Covered: ✔ Substances present in natural water ✔ Dissolved salts and minerals ✔ Dissolved oxygen and carbon dioxide ✔ Nitrates and phosphates ✔ Microorganisms and suspended impurities ✔ Effects on water quality and aquatic life ✔ Board exam preparation #10thClassChemistry #Chapter20 #Water #NaturalWater #ChemistryLecture #BoardPreparation #AhmadMughal #PunjabBoard #FBISE #Science.