Multiple choice general knowledge science & technology

When an iron nail gets rusted, iron oxide is formed

  1. without any change in the weight of the nail

  2. with decrease in the weight of the nail

  3. with increase in the weight of the nail

  4. without any change in colour or weight of the nail
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rusting is the oxidation of iron where iron reacts with oxygen from air to form iron oxide (Fe2O3). During this process, oxygen atoms combine with iron, so the total mass of the nail increases. The weight does not stay the same (A and D are wrong) nor does it decrease (B is wrong).

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