Question:
Which one of the following options represents the major components of oleum?
Which one of the following options represents the major components of oleum?
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Oleum = fuming sulfuric acid = \(\text{H}_2\text{SO}_4\) + \(\text{SO}_3\).
Used in nitration reactions and in the manufacture of explosives and dyes.
Strength of oleum is expressed as % free \(\text{SO}_3\).
Updated On: Aug 26, 2025
- Sulfuric acid and nitric acid
- Concentrated sulfuric acid and petroleum jelly
- Sulfuric acid and hydrochloric acid
- Sulfuric acid and sulfur trioxide
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The Correct Option is D
Solution and Explanation
Step 1: Oleum, also known as fuming sulfuric acid, is produced by dissolving sulfur trioxide (\(\text{SO}_3\)) in concentrated sulfuric acid.
Step 2: Its general composition can be expressed as: \[ \text{Oleum} = H_2SO_4 + xSO_3 \quad (x>0). \] Step 3: Options (A), (B), and (C) are incorrect because nitric acid, petroleum jelly, and hydrochloric acid are not components of oleum.
Step 4: Therefore, the correct major components are sulfuric acid and sulfur trioxide (Option D).
Step 2: Its general composition can be expressed as: \[ \text{Oleum} = H_2SO_4 + xSO_3 \quad (x>0). \] Step 3: Options (A), (B), and (C) are incorrect because nitric acid, petroleum jelly, and hydrochloric acid are not components of oleum.
Step 4: Therefore, the correct major components are sulfuric acid and sulfur trioxide (Option D).
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