Pick out the chemical changes from the following.
I : Condensation
II : Photosynthesis
III : Evaporation
IV : Cooking
V : Melting
A chemical change is a permanent change as the new substance(s) formed have a different composition than the original substance(s).
Condensation is the change of physical state of matter from gas to liquid.
Photosynthesis is a chemical change as it involves a chemical reaction. Carbon dioxide and water combine to form glucose and oxygen.
Evaporation is the change of physical state of matter from liquid to gas.
Cooking is a chemical change wherein the raw material(s) get permanently transformed into cooked food (new substance).
Melting is the change of physical state of matter from solid to liquid.
So, the answer is (ii) and (iv).