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Displacement Reaction

Formation of ...

Question

Formation of $S O_{3}$ from $S O_{2}$ and $O_{2}$ is a __________ (combination/decomposition) reaction.

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Solution

$2 S O_{2} + O_{2} ⟶ 2 S O_{3}$

Formation $S O_{3}$ from $S O_{2}$ and $O_{2}$ is a combination reaction. This is also an intermediate state of the manufacture of sulphuric acid and acid rain.
Hence, the correct answer is a combination.

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