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PIMSO 2025 - Science - Secondary 2 - National Round Question 9

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

Question 9

A metal object corrodes when it is exposed to the open air and bad weather. In iron, this change is called rusting in which weaker and flaky brown compound is formed. Which condition can cause severe rusting fast?
  1. Submerged in boiled water and oil layer.
  2. Submerged in salt water.
  3. Exposed in air and moisture.
  4. Exposed in air and calcium chloride.