Discussion
Which of the following statements is true ?
Answer: A
The true statement is Oxidation of Mn (II) to Mn (IV) is required for manganese ore precipitation.
Manganese is soluble as Mn2+ in reduced, oxygen-poor waters, and is carried in solution in that form. When those waters meet oxygenated conditions, Mn2+ is oxidised to Mn4+, which forms insoluble oxides such as pyrolusite and the oxides of manganese nodules and crusts. Most manganese ores are deposited by this oxidation.
Reduction does the reverse: it dissolves manganese oxides and mobilises the metal, so it cannot precipitate ore. Precipitation is therefore strongly redox-dependent, and both B and D are wrong.
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