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PIMSO 2025 - Science - Secondary 2 - National Round Question 10

PIMSO Science · PIMSO 2025 - Science - Secondary 2 - National Round

Question 10

In an experiment, one iron nail is wrapped in magnesium, another in copper and one left alone. The nail wrapped in magnesium is not corroded. Why?
  1. More reactive metal connected in the series protects from corrosion.
  2. Lesser reactive metal connected in the series protects from corrosion.
  3. Iron is not reactive with magnesium.
  4. Iron has the same component with magnesium.