state gov TSPSC Group 2 (తెలంగాణ గ్రూప్ 2) Mock Test Series General Science Chemistry States of Matter
Which of the following are not chemical changes?
1. Tempering of iron
2. Conversion of the iron piece into an electro-magnet by passing the current around the iron
3. Melting of iron
4. Rusting of iron
Select the correct answer using the code given below:
1
1 and 2 only
2
3 and 4 only
3
1, 2 and 3
4
1, 3 and 4