Question

During hydrotreatment, this element is removed from hydrocarbons using Raney (“ranny”) nickel, which allows refineries to reform naphtha (“NAP-tha”) fuels. Gypsum is made by scrubbing oxides of this element out of flue (20[1])gas. Oxides (20[1])of this element are injected into the stratosphere to form aerosols in a solar geoengineering (20[1])strategy inspired by volcanic winters. (20[2])This (20[1])nonmetal is at (20[1])the (20[1])octahedral (20[3])center of the most potent (*) greenhouse gas. (10[1])On Earth, (10[1])this element’s oxidation state cycles between minus-two, in minerals like galena and pyrite, (10[2])up to (10[1])plus-six, (10[1])after it is (10[1])oxidized (10[1])by oceanic chemo·lithotrophs. (10[1])Polluting oxides of nitrogen or this element produce acid rain. (10[1])For 10 (10[1])points, (10[2])a gas containing what element makes bogs smell eggy? (10[7])■END■ (10[5])

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