Chemistry · May / June 2022 · Paper 41 · Question 4
0620
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This question is about compounds of sulfur.
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4(a)(i)[1]
S + O2 → SO2
4(a)(ii)[4]
(temperature) 450 °C (1)
(pressure) 1–2 atmosphere(s) (1)
vanadium(V) oxide catalyst (1)
2SO2 + O2 ⇌ 2SO3 (1)
4(a)(iii)[1]
SO3 + H2SO4 → H2S2O7
4(a)(iv)[1]
water
4(b)(i)[2]
2 bonding pairs as one dot and cross each (1)
2 lone pairs on S (and no additional electrons on Hs) to complete the outer shell on S and both Hs (1)
4(b)(ii)[1]
2H2S + SO2 → 3S + 2H2O
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