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Which compound is used as a reducing bleach for papers(a) Sulfur trioxide(b) Sulfur(c) Sulfur dioxide(d) Hydrogen sulfideThis question was addressed to me in exam.My question comes from P-Block Elements topic in section P-Block Elements of Chemistry – Class 12

Answer»

Correct answer is (c) Sulfur dioxide

Explanation: In presence of water, SO2 is able to decolorize substances. Specifically, it is used as a reducing bleach for papers ALTHOUGH the bleaching EFFECT does not last very LONG. It is an ESSENTIAL process to REMOVE lignin, a natural element that causes paper to turn brown.



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