Chemistry · Oct / Nov 2021 · Paper 41 · Question 4
0620
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Chalcopyrite, FeCuS2, is used in the manufacture of sulfuric acid in the Contact process.i
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4(a)[2]
(4FeCuS 13O2) → 2Fe2O3 + 4CuO + 8SO2
Fe2O3 and CuO as a product (1)
Equation fully correct (1)
4(b)(i)[2]
M1 rate of forward reaction = rate of reverse reaction (1)
M2 concentration of reactants and products are constant (1)
4(b)(ii)[2]
M1 450 °C (1)
M2 1-2 atm (1)
4(b)(iii)[1]
vanadium(V) oxide
4(b)(iv)[1]
increase rate of reaction
4(b)(v)[2]
M1 equilibrium shifts to left hand side (1)
M2 forward reaction is exothermic (1)
4(c)[2]
C6H12O6 → 6C + 6H2O
H2O (1)
balance (1)
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