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According to van Niel, when the hydrogen donor is H₂S, the oxidised product is

(a) O₂ Your answer
(b) sulphate only Your answer
(c) sulphur Correct
(d) H₂O₂ Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

When H₂S is the hydrogen donor (purple and green sulphur bacteria), the oxidised product is sulphur, not oxygen.

Why the other options are wrong

(a) · your answer O₂ is released only when water is the donor.
(b) · your answer NCERT gives sulphur as the product.
(d) · your answer Hydrogen peroxide is not a product of bacterial photosynthesis.

NCERT point: This showed that the O₂ released by green plants comes from water.

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