Question

2. When you add water to sulfur dioxide and put a blue litmus paper in it, why does it
turn red?
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Answer 1

Answer:

it turns red because the solution is acidic. Sulphur is a non-metal and non metal oxides are always acidic.So that is why the blue litmus paper turns red

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Answer 2

Answer:

sulphur dioxide is a non-metal and non-metals are generally acidic in nature

when we react shulphur dioxide with water it form hydrogen sulphide and O2 gas which is acid, due to this when we put this product in blue litmus paper it turns in red because acid turn blue litmus into red