Which of these oxides reacts with water to form sulphuric acid?
(a) SO₂
(b) SO₃
(c) CO
(d) CO₂

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Solution

(b) SO₃

Sulphur trioxide (SO₃) reacts with water to form sulphuric acid.

SO₃(g) + H₂O (l) $\to$ H₂SO₄(aq)
Sulphur trioxide Water Sulphuric acid

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