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Match List-I with List-II. List-I (A) Concentration of Gold ore (B) Leaching of alumina (C) Froth stabilizer (D) Blister copper List-II (I) Aniline (II) NaOH (III) SO2 (IV) NaCN Choose the correct answer from the options given below.

1. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
2. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
3. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
4. (A)-(II), (B)-(IV), (C)-(III), (D)-(I)

Correct answer: (A)-(IV), (B)-(II), (C)-(I), (D)-(III)

Solution

The correct matches are based on the processes involved: Gold ore concentration typically uses sodium cyanide (NaCN) for extraction, alumina is leached using sodium hydroxide (NaOH), froth flotation employs aniline as a froth stabilizer, and blister copper is produced from the roasting of copper sulfide ores, which releases sulfur dioxide (SO2).

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