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The 2006 paper followed this structure exactly. Let’s break down the marking scheme section by section.
Question 2 of the 2006 paper presented two unknown inorganic salts (e.g., U and V ). The marking scheme emphasizes pairs. You cannot get a mark for inference without a correct observation.
After preparing a standard solution from the solid, candidates performed a redox titration using acidified Potassium manganate (VII) (Solution B). Marking Criteria:
In the 2006 exam, candidates were typically given a solution of sodium carbonate (Na₂CO₃) and an unknown hydrochloric acid (HCl). The task was to standardize the acid.
