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Directions for the following : Read the following three passages and answer the items that follow the passages. Your answers to these items should be based on the passages only.
When an international team of scientists pumped a carbon dioxide and water mix into underground basalt rocks, basic chemistry took over. The acidic mixture dissolved rocks' calcium and magnesium and formed limestone. Basically carbon dioxide is converted into stone, exclaimed the scientists.
Which one of the following statements best reflects the most logical, rational and practical suggestion implied by the passage ?
It is a cheap and practical method to produce limestone at commercial level for building purposes.
This can be used as one of the methods of carbon sequestration.
Basalt rock can be made a good source of calcium and magnesium minerals by this method.
Good rock-dissolving acid can be produced by mixing carbon dioxide and water.
- The passage discusses a scientific experiment where a carbon dioxide and water mixture was injected into basalt rocks, converting CO2 into limestone through basic chemistry.
- Option 1: Suggests using the method to produce limestone commercially. However, the passage implies its main interest in CO2 sequestration, not limestone production for building.
- Option 2: This option correctly identifies the main implication of the passage, which is highlighting a potential method for carbon sequestration by converting CO2 into stone.
- Option 3: Talks about extracting calcium and magnesium from basalt. While this happens in the process, the primary focus is not on mineral extraction.
- Option 4: Suggests producing rock-dissolving acid, but the passage only mentions the resultant reaction, not acid production.
The most accurate understanding of the passage is that it points to a method for carbon sequestration.
Correct Answer: Option 2 - This can be used as one of the methods of carbon sequestration.
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