Sulphur dioxide is dissolved in water. The solution is tested for acidic nature. What are the changes you will observe when you dip a litmus paper in the solution?

Red litmus turns blue

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Blue litmus turns to red

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No change occurs

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Blue litmus turns to yellow.

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Solution

The correct options are
B
Blue litmus turns to red

D
Blue litmus turns to yellow.

When sulphur dioxide is dissolved in water, it liberates hydrogen cations in water (As sulphur dioxide becomes sulphurous acid). It makes the solution acidic. As we know, the acidic solution turns blue litmus into red. So, when we dip a blue litmus paper in the solution, it turns into red but if we take a red litmus paper it will not show any change in colour.

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