Question

Which of the following is not a chemical change?

1. Digestion of food
Conversion of liquified petroleum gas into gas on opening the cylinder
2. photosynthesis
3. production of biogas from animal waste​

Answer 1

Answer:

Conversion of liquified petroleum gas into gas on opening the cylinder

Answer 2

Answer:

conversion of liquified petroleum gas into gas on opening the cylinder is not a chemical process

it is a physical process

hope it helps u friend