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NDA 2016 GAT · General Knowledge · Chemical Reactions · medium

Rusting of iron is a physical change. 2. Burning of a magnesium ribbon in air is a physical change.

Single correct option

Consider the following statements:
1. Rusting of iron is a physical change.
2. Burning of a magnesium ribbon in air is a physical change.
Which of the statements given above is/are correct?
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (D) Neither 1 nor 2

Rusting forms a new substance, hydrated iron oxide, and cannot be reversed by simple means, so it is a chemical change; statement 1 is false. Magnesium burns with a dazzling white flame to form magnesium oxide, again a new substance, so statement 2 is also false. Neither statement is correct.
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Original question written in the NDA 2016 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake