When sulphur is heated then a gas is formed which is when dissolved in water then a new substance is formed. The gas and new substance formed is:

H2S, H2SO3

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SO2, H2SO3

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SO3, H2SO4

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SO2, H2SO4

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Solution

The correct option is B
SO2, H2SO3

When sulphur is heated then sulphur reacts with oxygen in air to form SO2. When this gas reacts with water then sulphurous acid (H2SO3) is formed.

S + O2 →SO2

SO2+ H2O →H2SO3

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