railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test General Science Chemistry Chemical Reaction
Which of the following sets comprises only physical changes?
1
Rusting of iron and melting of ice - cream
2
Freezing of ice-cream and dissolving of candy
3
Burning of bread / roti and boiling of oil
4
Burning of roti / bread and corrosion of copper