Question

b) Which of these is a chemical change?
i. photosynthesis
iii. mixing salt in water
ii. mixing sugar in water
iv. cutting of wood​

Answer 1

Answer:

Photosynthesis

Explanation:

In the process of photosynthesis, carbon dioxide and water are chemically converted into oxygen and glucose in presence of sunlight absorbed by green pigment in the leaves called photosynthesis.

Whereas in others, only physical structure is changed. No chemical reaction is taking place.

Answer 2

Answer:

mixing salt in the water