The structure of these oxoacids will be as follow.
As we can see from the above structures only the Marshall Acid (H2S2O8) also known as peroxydisulphuric acid has the peroxo bond.
Consider the following sulphure based oxoacids. H2SO3,H2SO4,H2S2O8 and H2S2O7. Amongst these oxoacids, the number of those with peroxo (O−O)bond is
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By usual analysis, 1.00 g of compound $(\mathrm{X})$ gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound $(X)$ is : (nearest integer) (Given, molar mass in $\mathrm{g} \mathrm{mol}^{-1}: \mathrm{O}=16, \mathrm{Mg}=24, \mathrm{P}=31$)
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