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Question

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) H2SO4 (aq)
Sulphur trioxide Water Sulphuric acid

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