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Sulphuric acid is the combination or reaction of hydrogen and sulfate. Hydrogen has a valency electron of 1 and sulphate has a valency electron of 2- Therefore.
H + SO4 = H2S04. The valency electron of H goes to sulfate and since it is one, it is not visible...SO4 And the valency electron of SO4 goes to H, hence, H2. 
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