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Cement is made by heating the mixture of...

Cement is made by heating the mixture of limestone, sand and clay at a temperature of `1450–1600^@C` in a rotary kiln. The gypsum is also added between 2-5%.
The highest percentage of which compound is present in Portland cement?

A

`CaO`

B

`AI_2O_3`

C

`SiO_2`

D

`CaSO_2,2H_2O`

Text Solution

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The correct Answer is:
To determine the highest percentage compound present in Portland cement, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Composition of Portland Cement**: Portland cement is made up of several compounds. The main components include: - Calcium oxide (CaO) - Lime - Silica (SiO2) - Alumina (Al2O3) - Calcium sulfate (CaSO4) - Iron oxide (Fe2O3) - Magnesium oxide (MgO) - Sulfur and alkalis 2. **Identify the Percentages of Each Component**: The typical composition of Portland cement is as follows: - Calcium oxide (CaO) - 62% - Silica (SiO2) - 22% - Alumina (Al2O3) - 5% - Calcium sulfate (CaSO4) - 4% - Iron oxide (Fe2O3) - 3% - Magnesium oxide (MgO) - 2% - Sulfur - 1% - Alkalis - 1% 3. **Compare the Percentages**: Now, we will compare the percentages of each compound: - CaO: 62% - SiO2: 22% - Al2O3: 5% - CaSO4: 4% - Fe2O3: 3% - MgO: 2% - Sulfur: 1% - Alkalis: 1% 4. **Determine the Compound with the Highest Percentage**: From the comparison, it is clear that Calcium oxide (CaO) has the highest percentage at 62%. 5. **Conclusion**: Therefore, the compound present in the highest percentage in Portland cement is Calcium oxide (CaO). ### Final Answer: The highest percentage compound present in Portland cement is Calcium oxide (CaO). ---
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