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Dissolution is most effective under which condition?

Answer and explanation

Correct answer: In the presence of water-soluble minerals

The direct answer is D: dissolution is most effective when water-soluble minerals are present. Dissolution is a type of chemical weathering. In this process, water comes into contact with a mineral, some or all of the mineral goes into the water as a dissolved substance, and the material may then be carried away. The reasoning is: first, water must be available; second, the mineral must be capable of dissolving in water; third, continued contact with water helps remove the dissolved material. Salt and some limestone minerals provide familiar examples. Option A is wrong because a completely waterless surface does not provide the main agent needed for dissolution. Option B is wrong because molten lava is extremely hot, flowing rock; this is not the ordinary condition in which dissolution weathering is identified. Option C is wrong because a complete vacuum has no water and therefore cannot support normal water-based dissolution. Option D is correct because it includes both the important material condition—water-soluble minerals—and the process implied by water. A useful exam cue is: dissolution means “water dissolves mineral,” so look for water and soluble rock.

Related tags

DissolutionChemical WeatheringSoluble Minerals

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