What happens to the weight of iron, when it rusts?
Detailed Explanation:
Rusting is oxidation of iron (4Fe + 3O₂ → 2Fe₂O₃·xH₂O), where oxygen and water molecules bond to iron atoms, increasing total mass as hydrated iron oxide forms.
Over time, the rust layer flakes off or detaches from the surface due to its brittle nature, causing the overall weight to decrease.
Therefore, the weight first increases (oxidation) then decreases (flaking), making Option 2 the correct answer.
Question 2 of 3 Chemical Reactions
Practice PYQ questions from this topic across all years
Which of the following are exothermic processes? i. Evaporation of water.ii. Dilutio...
Consider the following statements : Addition of salt to pure water increases the b...