Question : When iron rusts, its weight
Option 1: decreases
Option 2: increases
Option 3: remains the same
Option 4: first increases and then decreases
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Correct Answer: increases
Solution : The correct option is to increase.
When iron rusts, its weight increases because iron oxide, which contains both iron and oxygen atoms, is formed. Rust is a hydrated iron oxide, also known as Fe 2 O 3 .xH 2 O. The iron atoms join with oxygen atoms to produce the iron oxide complex, and because of this, the iron's total weight increases as it rusts.
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