Chemical formula of oleum is A H<sub>2</sub>SO<sub>3</sub> B H<sub>2</sub>SO<sub>4</sub> C H<sub>2</sub>S<sub>2</sub>O<sub>7</sub> D H<sub>2</sub>SO<sub>7</sub> Chemical formula of oleum is Correct Answer H<sub>2</sub>S<sub>2</sub>O<sub>7</sub> Bissoy MCQ Team Chemical Engineering Chemical Process
