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Across the length and breadth of the country, there is a steel pipe line, meant for the transport of petroleum and its products. These steel pipes are protected from corrosion by sacrificial protection using thick metallic blocks of

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Calcium

Sodium

Caesium

Magnesium

answer is A.

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Detailed Solution

Magnesium

Rest of the three metals though more basic than Iron, they violently react with moisture / water in the soil. So, they are not used.

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