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Extraction and uses of metals

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Question 2

Iron, Fe\text{Fe}Fe, is a transition metal in the d-block of the Periodic Table.

The mineral, pyrite, contains iron disulfide, FeS2\text{FeS}_2FeS2​.

Iron can be obtained from pyrite in a three-stage process.

  • Stage 1: pyrite is roasted in air
4FeS2+11O2→2Fe2O3+8SO2 4\text{FeS}_2 + 11\text{O}_2 \rightarrow 2\text{Fe}_2\text{O}_3 + 8\text{SO}_2 4FeS2​+11O2​→2Fe2​O3​+8SO2​
  • Stage 2: the oxide produced is heated with carbon to form iron and carbon dioxide
a.

(i) State why the sulfur in stage 1 is said to be oxidised.

[1]
b.

(ii) Complete the equation for the reaction in stage 2.

2Fe2O3+‾C→‾Fe+‾CO2 2\text{Fe}_2\text{O}_3 + \underline{\quad\quad} \text{C} \rightarrow \underline{\quad\quad} \text{Fe} + \underline{\quad\quad} \text{CO}_2 2Fe2​O3​+​C→​Fe+​CO2​
[1]
c.

Nickel is another transition metal in the d-block of the Periodic Table.

Nickel forms an oxide, NiO\text{NiO}NiO, which has a giant ionic structure.

(i) Give the formula of the nickel ion in nickel(II) oxide.

[1]
d.

(ii) Explain why nickel(II) oxide has a high melting point.

[2]
e.

(iii) Nickel(II) oxide reacts with dilute hydrochloric acid to form nickel(II) chloride.

Write a chemical equation for this reaction.

[1]

Extraction and uses of metals Questions

  1. IGCSE
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  3. /Extraction and uses of metals