Dse Chemistry Past Paper By Topic ⚡

❌ – Repeating same mistake across topics = wasted time.

| Topic | Sub-topic | Years completed | % correct (first pass) | Weakness type | Next review date | | :--- | :--- | :--- | :--- | :--- | :--- | | Metals | Reactivity series | 2012–2024 | 70% | Displacement equations | 7 days | | Equilibrium | Kc calculation | 2015–2022 | 45% | Quadratic in Kc | 3 days | ❌ Doing every question every year – You don't need 2012 MC on acid-base if you mastered 2020–2024. Be selective. dse chemistry past paper by topic

| Topic | Weight (Paper 1) | Difficulty | Common Question Types | | :--- | :--- | :--- | :--- | | Redox & Electrochemistry | 15–18% | ⭐⭐⭐⭐ | Chemical cell vs electrolytic cell, half equations, rusting prevention | | Molarity & Mole Calculation | 12–15% | ⭐⭐⭐ | Titration calculation, limiting reagent, % by mass | | Organic Chemistry (I & II) | 18–20% | ⭐⭐⭐⭐ | IUPAC naming, reaction pathways, polymer structure | | Rate of Reaction | 8–10% | ⭐⭐⭐ | Graph slope, Maxwell-Boltzmann, catalyst experiments | | Equilibrium | 6–8% | ⭐⭐⭐⭐⭐ | Le Chatelier, Kc calculation (rarely Kp), concentration-time graphs | | Acids & Bases | 10–12% | ⭐⭐⭐ | pH, strong/weak, salt hydrolysis, titration curves | ❌ – Repeating same mistake across topics = wasted time