The buildings in this old mine are made of metal. You can see over 100 years, the silver color of the buildings has changed. The
2 answers:
Answer:
The correct answer is option B.
Explanation:
Iron in presence of moisture reacts with oxygen gas to from iron(III) oxide of red brown color often termed as rust.
Building material used up in min building is metal which which span of time changed its color to rust formation. Therefore this means rust or change in color is due to the iron metal which reacts with oxygen and water present in the air.
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Answer:
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The schematic diagram is attached below, which summarises the oxidation of ammonia or free nitrogen in the soil to nitrates for the cowpea plant's utilisation.
