Photolysis of each water molecule in light reaction will yield

Question

Photolysis of each water molecule in light reaction will yield (A) 2 electrons and 4 protons (B) 4 electrons and 4 protons (C) 4 electrons and 3 protons (D) 2 electrons and 2 protons

Tardigrade Admin · Accepted Answer

Photolysis is a chemical reaction produced by exposure to light or ultraviolet radiation. The photolysis of water, using energy from sunlight absorbed by chlorophyll, produces gaseous oxygen, electrons, and hydrogen ions or protons and is a key reaction in photosynthesis.

2 H_{2} O ⇌ 2 H^{+} + 2 O H^{-}

2 H^{+}

(protons) and 2 electrons evolved in this process. The protons released in the system are utilised for reduction of NADP while

O H^{-}

radical reacts to form

H_{2} O_{2}

which further breaks up into

H_{2} O

and

O_{2}

. The electrons are used in reducing PS-II.

Q. Photolysis of each water molecule in light reaction will yield

2 electrons and 4 protons

4 electrons and 4 protons

4 electrons and 3 protons

2 electrons and 2 protons