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In Bayer’s process, which substance is employed as the reagent?

1. Sodium carbonate
2. Carbon
3. Sodium hydroxide
4. Silica

Correct answer: Sodium hydroxide

Solution

In Bayer's process, powdered bauxite is leached with concentrated sodium hydroxide (NaOH), dissolving Al2O3 as sodium aluminate while impurities like Fe2O3 remain insoluble. So the reagent is sodium hydroxide.

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