how is number of atom is decided to written in a eqation ?like hydrogen sulphate as H₂SO₄not HSO₄or H2_H2SO3

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Solution

The reason why the formula for sulfuric acid is H2SO4 is because those are the atoms that make up sulfuric acid. Sulfuric acid is what is known as an oxyacid, and all oxyacids have oxygen in their constitution.
Heavily concentrated sulphuric acid is not dissociated into.hydrogen and sulphate ions and may be safely carried by road or rail in steel.containers.
It is only when water is added (a highly exothermic process) that it becomes reactive, as hydroyl.and sulphate ions.
Sulphur trioxide produced by catalysing sulphur dioxide with oxygen is the usual.means of manufacture. Enough water of hydrolysis is added to make the fully concentrated form:

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what are the important eqation to be remembered for test? like H2SO4 etc..

H {S O}_{4}^{-}

H {S O}_{4}^{-}

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