Formula of oleum is :

H_{2} S O_{3}

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H_{2} S O_{4}

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H_{2} S O_{5}

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H_{2} S_{2} O_{7}

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Solution

The correct option is D $H_{2} S_{2} O_{7}$
Oleum, or fuming sulfuric acid, is a solution of various compositions of sulfur trioxide in sulfuric acid, or sometimes more specifically to disulfuric acid (also known as pyrosulfuric acid).
Formula of oleum is $H_{2} S_{2} O_{7}$ .

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Similar questions

Out of $H_{2} S O_{4} (I), H_{2} S_{2} O_{7} (I I), H_{2} S O_{5} (I I I)$ and $H_{2} S_{2} O_{3} (I V)$ :

H_{2} S O_{4} (I), H_{2} S_{2} O_{8}, (I I) H_{2} S O_{5} I I I, H_{2} S_{2} O_{3} I V

H_{2} S_{2} O_{7} (V)

H_{2} S_{2} O_{3}

H_{2} S_{2} O_{4}

H_{2} S O_{5}

H_{2} S_{2} O_{8}

{S F}_{4}

H_{2} S_{2} O_{7}

H_{2} S_{2} O_{8}

H_{2} S, H_{2} S O_{4}, H_{2} S O_{3}, H_{2} S_{2} O_{3}

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