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The earliest photo synthesizers used which of the following as the source of hydrogen?

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The earliest photo synthesizers used which of the following as the source of hydrogen?

(a) CO2

(b) C6H12O6

(c) H2O

(d) H2S
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Correct answer is (d) H2S

To explain I would say: The earliest photo synthesizers used H2S as the source of hydrogen.
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