Give the structure of pyrosulphuric acid. How would you prepare it? What would you observe, when colourless $H I$ is added to sulphuric acid?

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Solution

$H_{2} S O_{4} 98 % + S O_{3} ⟶ H_{2} S O_{2} O_{7} o l e u m o r p y r o s u l p h u r i c a c i d$
$H O - O | | S | | O - O - O | | S | | O - O H$
$H_{2} S O_{4} + 2 H I c o l o u r l e s s ⟶ 2 H_{2} O + S O_{2} +_{2}$

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