In SO2 oxygen must be -2 so overall since there are 2 oxygens the charge will be -4. In order for the compound to be electrically neutral S must be +4. The correct answer here was SO2.
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Another question on Chemistry
Chemistry, 21.06.2019 20:30
10. translate each of the following chemical equations into a sentence. a. 2 zns(s) + 3 o2(g) -> 2 zno(s) + 2 so2(g) b. cah2(s) + 2 h2o(l) -> ca(oh)2 (aq) + 2 h2(g)