Civil Services TNPSC Group 1 (New Syllabus) Mock Test 2025 General Science Chemistry States of Matter
Which of the following are not chemical changes?
1. Tempering of iron
2. Melting of iron
3. Rusting of iron
Select the correct answer using the code given below:
1
1 and 2 only
2
2 and 3 only
3
1 and 3 only
4
1, 2 and 3