What happens to the weight of Iron, when it rusts?

[A] Increases for long time

[B] Decreases then increases

[C] Increases then decreases

[D] Remains the same

Notes: When iron or any other metal oxidizes, oxygen from the air combines with the iron to make iron oxide or rust. So, weight of the bar increases, due to the increased weight of oxygen which has combined with the iron. over time, the weight of the iron bar will tend to decrease, due to factors related more to erosion than to chemistry.

Thanks

Weight of iron and weight of iron bar are two different things.

In case of iron baar:

Due to rusting iron converted into Fe2O3 and weight increased. After a long time rusting separated from the iron bar so weight of iron bar will decrease.

 

Now in case of iron:

Iron converted into Fe2O3, due to rusting and it's weight increased and it will never decrease. So in regards to question, 'what happen to the weight of iron? .

Answer will be weight of iron will increase forever. 

Correct answer will be option 'A'. As per question.