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
Question
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
Solution
To determine which of the statements is correct, let's analyze each option step by step:
A. Iron and rust are the same substance: This statement is incorrect. Iron and rust are not the same substance. Iron is a metal, while rust is a compound that forms when iron reacts with oxygen and water.
B. Rusting of iron is a chemical change: This statement is correct. Rusting of iron is indeed a chemical change. It involves the oxidation of iron, where iron reacts with oxygen in the presence of water to form iron oxide (rust).
C. Removal of rust from the surface of iron is a chemical change: This statement is incorrect. The removal of rust from the surface of iron is not a chemical change. It is a physical process that involves scraping, sanding, or using rust removers to physically remove the rust from the iron surface.
D. All of the above: This option is incorrect because statement A is incorrect. Therefore, the correct answer is option B: "Rusting of iron is a chemical change."
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