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Date November 2011 Marks available 1 Reference code 11N.3.sl.TZ0.C1
Level SL Paper 3 Time zone TZ0
Command term State Question number C1 Adapted from N/A

Question

The Industrial Revolution was the result of large-scale extraction of iron from its ore and had significant impact worldwide.

In a blast furnace, a large volume of air is introduced under pressure near the bottom while a mixture of limestone, coke and iron(III) oxide is introduced at the top.

State the equation for the reaction of coke with air in the blast furnace.

[1]
a.i.

The product formed in part (i) reacts with coke to produce carbon monoxide. Explain, giving an equation, why this reaction is important in the extraction of iron.

[2]
a.ii.

Markscheme

\({\text{C(s)}} + {{\text{O}}_2}{\text{(g)}} \to {\text{C}}{{\text{O}}_2}{\text{(g)}}\);

Ignore state symbols.

a.i.

CO acts as a reducing agent / reaction is endothermic/cools (this part of) furnace;

\({\text{C}}{{\text{O}}_2}{\text{(g)}} + {\text{C(s)}} \to {\text{2CO(g)}}/{\text{F}}{{\text{e}}_2}{{\text{O}}_3}{\text{(s)}} + {\text{3CO(g)}} \to {\text{2Fe(l)}} + {\text{3C}}{{\text{O}}_2}{\text{(g)}}\);

Ignore state symbols.

a.ii.

Examiners report

Generally the equation for the reaction of coke with air was given correctly.

a.i.

The correct equation for the reaction of \({\text{C}}{{\text{O}}_2}\) with coke was sometimes missing

a.ii.

Syllabus sections

Options » A: Materials » A.2 Metals and inductively coupled plasma (ICP) spectroscopy
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