2014 · Q106
Which of the 'following are not chemical changes?
- 1Tempering of iron
- 2Conversion of iron piece into an electro-magnet by passing the current around the iron.
- 3Melting of iron
- 4Rusting of iron
Select the correct answer using the codes given below. Codes:
general-sciencechemistry
- A1 and 2
- B3 and 4
- C1, 2 and 3
- D1, 3 and 4
Explanation
Tempering, magnetizing and melting iron are physical changes; only rusting is a chemical change - 1, 2 and 3 are not chemical changes.