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The correct matching is: • A. Washing Soda — Sodium Carbonate (3) • B. Calcium Soda — Sodium Thiosulfate (4) • C. Blue Phosphate — Sodium Hydroxide (2) • D. Hyposo — Sodium Hydrogen Iodide (1) Thus, the correct answer is (b) A-4, B-1, C-3, D-2. Washing soda is chemically known as Sodium Carbonate (Na₂CO₃), used for cleaning and softening water. Calcium soda is commonly associated with Sodium Thiosulfate (Na₂S₂O₃), used in photography and water treatment. Blue Phosphate is a form of Sodium Hydroxide (NaOH), an alkaline solution used for cleaning and in chemical manufacturing. Hyposo is the name for Sodium Hydrogen Iodide (NaI), commonly used in iodine-related reactions.
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