Is it correct to say that sulphur dioxide gas will only turn moist blue litmus paper red but will not bleach it?

Answer 1

I think the answer is yes and no. For a short exposure time AND for small amounts of SO2 generated, moistened litmus paper and SO2 will give the acid test (meaning the litmus paper will turn color); however, with large amounts of SO2 and exposure times long enough,I think enough reaction will occur to bleach the litmus paper.

Answer 2

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