NEET Exam Strategy for INC-06

Weightage: This chapter consistently yields 1 question per year in NEET (occasionally 2). It is a high-return, low-effort chapter if core facts are memorised.
Highest-yield topics (in order): (1) Ellingham diagram interpretation, (2) Extraction process identification per metal, (3) Refining method per metal, (4) Concentration method per ore type.
Ellingham questions always test: why C→CO line slopes down, which metal reduces which oxide, or the crossover temperature concept. Memorise $\Delta G$ = $\Delta H$ − T $\Delta S$ and the positive $\Delta S$ argument for 2C + $O_{2}$ → 2CO.
Process matching questions: Know Al → Hall-Heroult (electrolysis); Cu → self-reduction (Bessemer); Fe → blast furnace (CO reduction); Ni → Mond; Ti → Van Arkel; Si → zone refining.
Ore formula questions: Flashcard the 9 ore formulas in the table. Copper pyrite ( $CuFeS_{2}$ ) and cryolite ( $Na_{3}AlF_{6}$ ) are the most commonly confused.
Froth flotation details: Collector = pine oil; Frother = pine oil / cresol; Depressant = NaCN (for ZnS). These three roles are frequently tested as MCQ options.
Hall-Heroult specifics: Cryolite lowers m.p. to ~950 °C; $CaF_{2}$ increases conductivity; carbon anodes are consumed. All three details appear as NEET distractors.
Calcination vs Roasting trap: The most common trap MCQ. Always ask: what kind of ore? Sulphide → roasting (excess air). Carbonate/hydrated → calcination (limited air).
Time allocation: This chapter merits 10–15 minutes of revision per week in Phase 3. Do not over-invest — one well-prepared question is the target.
Elimination strategy: In process/method MCQs, eliminate by atmosphere (air condition) or metal type first, then apply thermodynamic reasoning.