Question

Why does the colour of copper sulphate solution change,
when an iron nail is dipped in it
Why is photosynthesis considered as an endothermic
reaction?​

Answer 1

Answer:

Iron being a more active metal as compared to copper displaces it from it's solution

Hence the solution changes to green colour

Answer 2

Answer:

Because of this rnx

CuSO4(blue) +Fe -------> FeSO4(green) + Cu.

A displacemt reaction leads to formation of other salt.

Photosynthesis leads to formation of glucose which stores energy. hence it is endothermic reaction. it takes energy from sunlight.

HOPE IT HELPS......