Which of the reaction is suitable for concentrating ore by leaching process?
- \(2 Cu _2 S +3 O _2 \rightarrow 2 Cu _2 O +2 SO _2\)
- \(Fe _3 O _4+ CO \rightarrow 3 FeO + CO _2\)
- \(Al _2 O _3+2 NaOH +3 H _2 O \rightarrow 2 Na \left[ Al ( OH )_4\right]\)
- \(Al _2 O _3+6 Mg \rightarrow 6 MgO +4 Al\)
The Correct Option is C
Solution and Explanation
The suitable reaction for concentrating ore by leaching process is:
\(Al _2 O _3+2 NaOH +3 H _2 O \rightarrow 2 Na \left[ Al ( OH )_4\right]\)
This is because the reaction involves the conversion of the metal oxide (in this case, aluminum oxide) into a water-soluble form (sodium aluminate), which can be easily separated from the impurities in the ore through leaching. Leaching involves dissolving the desired metal compound using a suitable solvent, in this case, sodium hydroxide solution. This process allows for the concentration of the ore by selectively dissolving the desired metal compound while leaving behind the impurities.
So, the correct option is (C).
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Concepts Used:
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What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal