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Sulphur photosynthetic bacteria

In sulphur photosynthetic bacteria name the molecule which donates hydrogen for photosynthesis?

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In sulphur photosynthetic bacteria the substance which donates hydrogen is hydrogen sulphide (H2S) and not water. Thus there is no release of molecular oxygen however there is production of molecular sulphur (S2). (Oxygen and sulphur contain similar number of valence electrons.)

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