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What common change occurs in iron bearing minerals during oxidation weathering?

Answer and explanation

Correct answer: They form oxides and give red or brown colour

Direct answer: B, iron-bearing minerals form oxides and produce red or brown colour. Oxidation is a chemical reaction in which oxygen combines with a substance. When oxygen and moisture act on iron minerals, iron oxides or hydroxides form, much like rust on iron. These products commonly colour rocks reddish, brownish or yellowish and may weaken them. A is wrong because weathering does not turn iron minerals immediately into glass. B is correct because it states both the chemical change and the usual colour effect. C is wrong: oxidation is not vaporisation, and ordinary weathering does not make minerals simply become vapour. D is wrong because oxidation changes minerals and often changes colour; they do not remain completely stable. Exam cue: iron plus oxygen and water suggests rust, red-brown colour and chemical weathering.

Related tags

OxidationIronChemicalWeathering

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