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B
sulphurous acid
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C
sulphonic acid
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D
oleum
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Solution
The correct option is B sulphurous acid Sulphurous acid is a weak dibasic acid. Sulphurous acid is an intermediate species in the formation of acid rain from sulphur dioxide. SO2+H2O⇌H2SO3. These are used as reducing agents and as disinfectants or mild bleaches.