Which of the following is released in the manufacture of calcium silicate cement $(C a S i O_{4})$ ?

Sulfur trioxide

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Sulfur dioxide

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Oxygen gas

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Water gas

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Solution

The correct option is B Sulfur dioxide
Sulfur dioxide can also be a byproduct in the manufacture of calcium silicate cement; $C a S O_{4}$ is heated with coke and sand in this process:
$2 C a S O_{4} + 2 S i O_{2} + C ⟶ 2 C a S i O_{3} + 2 S O_{2} + C O_{2}$

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