For which one of the following reaction, the graph of `DeltaG` against T is almost horizontal to temperature axis

For which one of the following reaction, the graph of `DeltaG` against T is almost horizontal to temperature axis
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For which one of the following reaction, the graph of `DeltaG` against T is almost horizontal to temperature axis A. ... ((s))+O_(2(g)) to 2MgO(g)`
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