Oleum is
Oleum is
A
castor oil
B
oil of vitriol
C
fuming `H_(2)SO_(4)`
D
None of these
Text Solution
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The correct Answer is:
### Step-by-Step Solution
1. **Understanding Oleum**: Oleum is a term used to describe a specific chemical compound related to sulfuric acid. It is not castor oil or any other oil.
2. **Chemical Composition**: Oleum is essentially a solution of sulfur trioxide (SO3) in sulfuric acid (H2SO4). The chemical formula for oleum can be represented as H2S2O7, which is also known as pyrosulfuric acid.
3. **Formation of Oleum**: Oleum is formed when sulfuric acid is concentrated. This can be achieved by removing water from sulfuric acid. When two molecules of H2SO4 are combined and water is removed, it leads to the formation of oleum.
4. **Properties of Oleum**: Oleum is known for being a fuming liquid, which means it emits vapors that can be seen as smoke. This is due to the presence of sulfur trioxide, which is highly reactive and can form sulfuric acid upon contact with moisture.
5. **Conclusion**: Therefore, oleum is commonly referred to as fuming sulfuric acid, and its chemical name is pyrosulfuric acid. The correct answer to the question is that oleum is fuming H2SO4.
### Step-by-Step Solution
1. **Understanding Oleum**: Oleum is a term used to describe a specific chemical compound related to sulfuric acid. It is not castor oil or any other oil.
2. **Chemical Composition**: Oleum is essentially a solution of sulfur trioxide (SO3) in sulfuric acid (H2SO4). The chemical formula for oleum can be represented as H2S2O7, which is also known as pyrosulfuric acid.
3. **Formation of Oleum**: Oleum is formed when sulfuric acid is concentrated. This can be achieved by removing water from sulfuric acid. When two molecules of H2SO4 are combined and water is removed, it leads to the formation of oleum.
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The percentage labelling (mixture of H_(2)SO_(4) and SO_(3)) refers to the total mass of pure H_(2)SO_(4) .The total amount of H_(2)SO_(4) found after adding calculated amount of water to 100 g oleum is the percentage labelling of oleum. Higher the percentage lebeling of oleum higher is the amount of free SO_(3) in the oleum sample. The percent free SO_(3) is an oleum is 20%. Label the sample of oleum in terms of percent H_(2) SO_(4) .
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