Chemistry · Oct / Nov 2023 · Paper 42 · Question 3
0620
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Iron is manufactured in a blast furnace.
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3(a)[1]
(hot) air
3(b)(i)[1]
hematite
3(b)(ii)[1]
Fe2O3 + 3CO → 3CO2 + 2Fe
3(b)(iii)[2]
M1 from +3 (1)
M2 to 0 (1)
3(b)(iv)[1]
decrease (in oxidation number)
3(c)[4]
M1 CaCO3 → CaO + CO2 (1)
M2 thermal decomposition (1)
M3 SiO2 + CaO → CaSiO3 (1)
M4 acid-base reaction (1)
3(d)(i)[1]
alloy
3(d)(ii)[1]
nickel / chromium
3(e)[1]
hydrated iron(III) oxide
3(f)(i)[1]
galvanising
3(f)(ii)[1]
painting / greasing / coating with plastic
3(f)(iii)[2]
M1 zinc more reactive (than iron) (1)
M2 zinc corrodes / oxidises / reacts in preference to / instead of iron (1)
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