Question:medium
Oleum is
Oleum is
Updated On: May 5, 2026
- castor oil
- oil of vitriol
- $fuming \, H_2SO_4$
- None of these
Show Solution
The Correct Option is C
Solution and Explanation
To understand what "Oleum" refers to among the given options, we need to examine each choice in the context of chemistry, specifically in relation to sulfuric acid derivatives.
- Option 1: Castor Oil
- Castor oil is a vegetable oil obtained from the seeds of the castor oil plant. It is a triglyceride and used primarily in food processing and medicine. It is not related to sulfuric acid or its derivatives.
- Conclusion: Castor oil does not relate to oleum, so this option is incorrect.
- Option 2: Oil of Vitriol
- "Oil of vitriol" is an old name for sulfuric acid (H_2SO_4), specifically referring to its concentrated form. While it is related to sulfuric acid, oleum specifically refers to another substance.
- Conclusion: While related to sulfuric acid, this is not the exact definition of oleum, so this option is also incorrect.
- Option 3: Fuming H_2SO_4
- Fuming sulfuric acid, also known as oleum, is a solution of various compositions of sulfur trioxide (SO_3) in sulfuric acid. It is characterized by releasing fumes of sulfur trioxide.
- Conclusion: Oleum is indeed fuming H_2SO_4, making this the correct answer.
- Option 4: None of these
- This option would be correct only if none of the above were correct. However, as established, option 3 matches the definition of oleum.
- Conclusion: This option is incorrect.
Final Answer: The correct answer is "fuming \, H_2SO_4", which is the scientific name for oleum.
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