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Take some water in a test tube. Pass the...

Take some water in a test tube. Pass the sulphur dioxide (`SO_2`) has through it.
a) Dip a litmus paper in the solution thus obtained. What do you observe?
b) Write down the chemical equation of the reaction taking place there.

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a) Blue litmus paper turns red.
b) .SO_2 + H_2O rarr H_2SO_3.
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