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Which of the following metals is/are subjected to increased attack in the presence of oxygen?

Which of the following metals is/are subjected to increased attack in the presence of oxygen? Correct Answer Copper and its alloys, cast iron and steels

Dissolved oxygen will be reduced cathodically into hydroxide ions in many of the corrosion systems and it increases the dissolution of metal anodically. Metals such as copper and its alloys, cast iron and steels are subjected to increase attack in the presence of oxygen.

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(i) Increased if drawbar HP of the tractor is increased for a given hauling distance
(ii) Decreased if drawbar HP of the tractor is increased for a given hauling distance
(iii) Increased if the hauling distance is increased for a given drawbar HP of the tractor
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