Class 7 Exam > Class 7 Questions > Which of the following statements is correct?...
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Which of the following statements is correct?
- a)Iron and rust are same substance.
- b)Rusting of iron is a chemical change.
- c)Removal of rust from surface of iron is chemical change.
- d)All of the above
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following statements is correct?a)Iron and rust are same ...
Properties of rust is different from iron.
This question is part of UPSC exam. View all Class 7 courses
Most Upvoted Answer
Which of the following statements is correct?a)Iron and rust are same ...
**Explanation:**
Rusting of iron is a chemical change. Let's understand why this statement is correct.
**Chemical Change:**
A chemical change is a process that leads to the formation of a new substance with different properties from the original substance. In a chemical change, the atoms rearrange themselves, forming new bonds and breaking old bonds.
**Rusting of Iron:**
When iron comes in contact with oxygen and moisture, it undergoes a chemical reaction called rusting. Rust is the product of this reaction, and it is formed by the combination of iron, oxygen, and water molecules.
**Evidence of Rusting as a Chemical Change:**
1. **Formation of New Substance:** When iron rusts, a new compound called iron(III) oxide is formed. This compound has different properties than iron.
2. **Color Change:** Iron is silver-gray in color, while rust is reddish-brown. This color change indicates the formation of a new substance.
3. **Irreversibility:** Rusting is an irreversible process. Once iron starts rusting, it cannot be easily reversed or converted back to pure iron.
**Comparison with Other Statements:**
a) Iron and rust are not the same substance. Iron is a pure element, while rust is a compound formed by the reaction of iron with oxygen and water. They have different chemical compositions and properties.
c) The removal of rust from the surface of iron is a physical change. It involves the scraping or cleaning off of the rust, but the chemical composition of the iron remains the same.
**Conclusion:**
Based on the evidence provided, the statement that "Rusting of iron is a chemical change" is correct. It involves the formation of a new substance (rust) with different properties from the original substance (iron).
Rusting of iron is a chemical change. Let's understand why this statement is correct.
**Chemical Change:**
A chemical change is a process that leads to the formation of a new substance with different properties from the original substance. In a chemical change, the atoms rearrange themselves, forming new bonds and breaking old bonds.
**Rusting of Iron:**
When iron comes in contact with oxygen and moisture, it undergoes a chemical reaction called rusting. Rust is the product of this reaction, and it is formed by the combination of iron, oxygen, and water molecules.
**Evidence of Rusting as a Chemical Change:**
1. **Formation of New Substance:** When iron rusts, a new compound called iron(III) oxide is formed. This compound has different properties than iron.
2. **Color Change:** Iron is silver-gray in color, while rust is reddish-brown. This color change indicates the formation of a new substance.
3. **Irreversibility:** Rusting is an irreversible process. Once iron starts rusting, it cannot be easily reversed or converted back to pure iron.
**Comparison with Other Statements:**
a) Iron and rust are not the same substance. Iron is a pure element, while rust is a compound formed by the reaction of iron with oxygen and water. They have different chemical compositions and properties.
c) The removal of rust from the surface of iron is a physical change. It involves the scraping or cleaning off of the rust, but the chemical composition of the iron remains the same.
**Conclusion:**
Based on the evidence provided, the statement that "Rusting of iron is a chemical change" is correct. It involves the formation of a new substance (rust) with different properties from the original substance (iron).
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Which of the following statements is correct?a)Iron and rust are same substance.b)Rusting of iron is a chemical change.c)Removal of rust from surface of iron is chemical change.d)All of the aboveCorrect answer is option 'B'. Can you explain this answer?
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