Calcium oxide, CaO, is used to remove $S O_{2}$ from power plant exhaust. In what form CaO removes $S O_{2}$ ?

C a S O_{3}

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C a S O_{4}

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C a (H S O_{3})_{2}

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C a (H S O_{4})_{2}

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Solution

The correct option is B $C a S O_{4}$
Reaction:

$2 C a O + 2 S O_{2} + O_{2} \to 2 C a S O_{4}$

So, it is remove in the form of $C a S O_{4}$ .

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