নিচের এসিডগুলোর মধ্যে কোনটি ‘পাইরো’ এসিড?

A $HClO_{4}$

B $H_{3}PO_{3}$

C $H_{2}SO_{4}$

D $H_{2}S_{2}O_{7}$

Solution

Correct Answer: Option D

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