Q.

What is observed when sulphur dioxide is passed through water?

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a

Sulphurous acid is formed 

b

Nitric acid is formed

c

Sulphurous acid is formed

d

Aqueous solution of sulphur dioxide gas is formed

answer is D.

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Detailed Solution

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When sulphur dioxide is passed through water then sulphurous acid is formed.
Non-metallic oxides are acidic in nature. Therefore, when they are dissolved in water formation of acid takes place. 

SO2+H2OH2SO3

When sulphur dioxide gas is passed through water formation of sulphurous acid takes place which turns blue litmus red.

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