Fill in the blank spaces by choosing the correct words from the given list.
List: Suphurous, nitric acid, slowly, oxygen, phosphoric
Sulphur dioxide gas dissolves in water to form __________ acid.

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Solution

When sulphur dioxide is dissolved in water it forms sulphurous acid.
$\underset{Sulphur dioxide water sulphurous acid}{{SO}_{2} + H_{2} O \to H_{2} {SO}_{3}}$
Therefore, sulphur dioxide gas dissolves in water to form suphurous acid.

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