Fuming sulphuric acid is commercially known as:

Caro's acid

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Marshall'sacid

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Oleum

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Sulphurous acid

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Solution

The correct option is B Oleum
$H_{2} S_{2} O_{7} (H_{2} S O_{4} + S O_{3})$ - Fuming Sulphuric acid is also known as oleum.

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