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Q. Oxygen which is liberated during photosynthesis, comes from

ManipalManipal 2008

Solution:

Oxygen, which is liberated during photosynthesis comes from $H _{2} O . CO _{2}$, reduced to form carbohydrate during photosynthesis.
Chlorophyll is '$Mg$' containing green pigment which helps in photosynthesis.
Phosphoglyceric acid is the first stable product of photosynthesis in $C_{3}$ plants.
$4 H _{2} O \rightleftharpoons 4 H ^{+}+4 OH ^{-} $
$4 OH ^{-} \ce{->[ Mn ^{+}, Cl ^{-}]} 2 H _{2} O + O _{2} \uparrow+4 e^{-}$