Pure Substance vs Compound — NTSE Trick in 59 Sec ⚡
❓ Question Why are compounds called pure substances even though their properties are completely different from their constituent elements? ✍️ Short Solution This is a concept clarity + assertion–reason logic question. No formula — just definition + reasoning separation 💯 🔹 Step 1 — Pure Substance Definition (MOST IMPORTANT 💯) 👉 Pure substance ka matlab: Fixed composition + uniform properties \text{Fixed composition + uniform properties} 👉 Is category me aate hain: Elements Compounds 📌 “Pure” ka matlab single type of particle , not “same properties” 🔹 Step 2 — Elements vs Compounds 👉 Element: Sirf ek type ke atoms Example: H₂, O₂ 👉 Compound: Different elements ka fixed ratio me combination Example: H₂O CO₂ 📌 Ratio always fixed hota hai → isi wajah se pure substance 🔹 Step 3 — Property Change Concept 👉 Jab compound banta hai: Properties of compound ≠ Properties of elements \text{Pro...