2H2 + O2 --> 2H2O can be classified as what type of reaction? A. Both synthesis and combustion. B. Only synthesis C. Only combustion D. It cannot be classified.

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I believe the answer is B. Only synthesis.
The given equation is classified as a SYNTHESIS reaction wherein two simpler molecules, H2 and O2, combine to form a more complex one which is water (H2O). Further, this can also be classified as the combustion of hydrogen gas. The answer is letter A.