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What happens to the weight of iron, when it rusts?
- a)Decreases then increases
- b)Increases then decreases
- c)Remains same
- d)Increases
- e)None of the above/More than one of the above
Correct answer is option 'B'. Can you explain this answer?
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What happens to the weight of iron, when it rusts?a)Decreases then inc...
The correct answer is Increases then decreases
Concept:
- Corrosion refers to the eating up of metals by the action of air, moisture, or a chemical on their surface.
- The reaction of iron and oxygen forms an iron oxide which is a reddish-brown oxide.
- This is called Rust or corrosion of iron metal.
- This reaction happens only in presence of oxygen and moisture.
- The presence of impurities like Moisture, Acid, salt, Temperature, Presence of acid, etc. is some factor that affects corrosion.
Explanation:
- When the iron nail gets rusted, the weight of the nail increases.
- It is because a layer of iron oxide is formed on the surface of the iron nail.
- The iron oxide layer is adding oxygen and hydrogen to the nail.
- Here is the chemical reaction of Rust:-
- 2Fe2+ 3O2 → 2Fe2O3
- Fe2O3 + xH2O → Fe2O3. xH2O (rust)
Thus, the correct answer is Increases then decreases
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What happens to the weight of iron, when it rusts?a)Decreases then inc...
Understanding Iron Rusting
When iron rusts, it undergoes a chemical reaction with oxygen and moisture in the environment, forming iron oxide, commonly known as rust. This process can be analyzed in terms of weight change.
Initial Weight of Iron
- The weight of the iron object remains constant until the rusting process begins.
- This is because the iron is still in its metallic state, and no mass is lost or gained.
Rust Formation
- When iron starts to rust, it reacts with oxygen and water, leading to the formation of iron oxide.
- The reaction can be represented as: 4Fe + 3O2 + 6H2O → 4Fe(OH)3 (which further dehydrates to form rust).
Weight Change During Rusting
- As rust forms, the iron combines with oxygen from the air. This process initially causes the total weight to increase because you are adding oxygen to the iron.
- The weight increases because the added oxygen becomes part of the rust compound.
Final Weight After Rusting
- Over time, rust can flake off or deteriorate, leading to potential weight loss.
- However, the initial reaction leads to an increase in weight due to the incorporation of additional oxygen.
Conclusion
Thus, the correct answer is option B: "Increases then decreases." The weight increases during the formation of rust and may decrease if the rust flakes off or deteriorates over time.
When iron rusts, it undergoes a chemical reaction with oxygen and moisture in the environment, forming iron oxide, commonly known as rust. This process can be analyzed in terms of weight change.
Initial Weight of Iron
- The weight of the iron object remains constant until the rusting process begins.
- This is because the iron is still in its metallic state, and no mass is lost or gained.
Rust Formation
- When iron starts to rust, it reacts with oxygen and water, leading to the formation of iron oxide.
- The reaction can be represented as: 4Fe + 3O2 + 6H2O → 4Fe(OH)3 (which further dehydrates to form rust).
Weight Change During Rusting
- As rust forms, the iron combines with oxygen from the air. This process initially causes the total weight to increase because you are adding oxygen to the iron.
- The weight increases because the added oxygen becomes part of the rust compound.
Final Weight After Rusting
- Over time, rust can flake off or deteriorate, leading to potential weight loss.
- However, the initial reaction leads to an increase in weight due to the incorporation of additional oxygen.
Conclusion
Thus, the correct answer is option B: "Increases then decreases." The weight increases during the formation of rust and may decrease if the rust flakes off or deteriorates over time.
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