Which statement best describes manganese dioxide (MnO2) in soils?

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Multiple Choice

Which statement best describes manganese dioxide (MnO2) in soils?

Explanation:
The key idea is that manganese dioxide in soils is a solid oxide mineral. In soils, manganese most often exists in the Mn(IV) state as oxides and hydroxides, and MnO2 forms as a solid precipitate or coating on soil particles. It tends to stay as a solid phase and is not a gas, a soluble metal ion, or a liquid under typical soil conditions. Under reducing conditions MnO2 can be converted to Mn2+, but as MnO2 itself it remains a solid oxide commonly found in soils.

The key idea is that manganese dioxide in soils is a solid oxide mineral. In soils, manganese most often exists in the Mn(IV) state as oxides and hydroxides, and MnO2 forms as a solid precipitate or coating on soil particles. It tends to stay as a solid phase and is not a gas, a soluble metal ion, or a liquid under typical soil conditions. Under reducing conditions MnO2 can be converted to Mn2+, but as MnO2 itself it remains a solid oxide commonly found in soils.

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