Match the unit operation in Column I with the resulting product in Column II:
Column I Column II (P) COREX Process (1) Direct Reduced Iron (Q) Bayer Process (2) Pig Iron (R) Matte Smelting (3) Alumina (S) MIDREX Process (4) Copper
| Column I | Column II |
|---|---|
| (P) COREX Process | (1) Direct Reduced Iron |
| (Q) Bayer Process | (2) Pig Iron |
| (R) Matte Smelting | (3) Alumina |
| (S) MIDREX Process | (4) Copper |
Show Hint
- P-4, Q-3, R-2, S-1
- P-2, Q-3, R-4, S-1
- P-1, Q-3, R-4, S-2
- P-2, Q-4, R-3, S-1
The Correct Option is B
Solution and Explanation
The question gives four named unit operations from extractive metallurgy and asks which product each one gives. To answer it, we need to know what each named process is used for.
Step 2: Match COREX Process (P).
The COREX process is a smelting reduction process. It uses iron ore, coal, and oxygen directly, without a coke oven or sinter plant, and produces liquid hot metal, which is pig iron.
So P matches with (2) Pig Iron.
Step 3: Match Bayer Process (Q).
The Bayer process treats bauxite ore with hot caustic soda (NaOH) to dissolve the aluminium-bearing minerals, leaving behind red mud as waste. The dissolved aluminium hydroxide is then precipitated and calcined to give alumina (Al2O3).
So Q matches with (3) Alumina.
Step 4: Match Matte Smelting (R).
Matte smelting is used mainly in copper extraction from sulphide ores. The furnace charge melts into two layers, a slag layer and a matte layer (mixed copper and iron sulphides). The matte is later converted to blister copper.
So R matches with (4) Copper.
Step 5: Match MIDREX Process (S).
The MIDREX process is a gas-based direct reduction process. It reduces iron ore pellets or lump ore below the melting point using a reducing gas (mostly hydrogen and carbon monoxide from reformed natural gas), giving solid sponge iron.
So S matches with (1) Direct Reduced Iron.
Step 6: Compile the match and check the options.
The correct match is P-2, Q-3, R-4, S-1.
Comparing with the given options, this matches option (B) exactly.
Final Answer:
P-2, Q-3, R-4, S-1 is the correct combination.
\[ \boxed{\text{P-2, Q-3, R-4, S-1}} \]
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