Chemistry · Oct / Nov 2025 · Paper 42 · Question 2
0620
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Iron is extracted from iron ore in a blast furnace.
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2(a)(i)[1]
hematite
2(a)(ii)[1]
burning of carbon (coke)
2(a)(iii)[1]
carbon monoxide
2(a)(iv)[2]
3CO + Fe2O3 → 2Fe + 3CO2
M1 species
M2 correct equation
2(a)(v)[2]
M1 CaCO3 → CaO + CO2
M2 CaO + SiO2 → CaSiO3
2(b)[2]
M1 atoms of the same element that have the same number of protons
M2 but different numbers of neutrons
2(c)(i)[3]
p = 26 and 26
n = 28 and 32
e = 24 and 23
2(c)(ii)[2]
M1 NaOH(aq) OR NH3(aq)
M2 green ppt.
(insoluble in excess, ppt. turns brown near surface on standing)
2(d)(i)[2]
a substance that oxidises another substance and is itself reduced
M1 ‘a substance’ oxidises another substance
M2 is itself reduced
2(d)(ii)[1]
loss of (one) electron
2(d)(iii)[1]
acidified
2(e)[1]
iodine
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