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Extraction and uses of metals

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Question 13

Cobalt, Co\text{Co}Co, is a transition metal.

The mineral jaipurite contains cobalt sulfide, CoS\text{CoS}CoS.

Cobalt can be obtained from cobalt sulfide in a three-stage process.

  • Stage 1: jaipurite is roasted in air
3CoS+5O2→Co3O4+3SO2 3\text{CoS} + 5\text{O}_2 \rightarrow \text{Co}_3\text{O}_4 + 3\text{SO}_2 3CoS+5O2​→Co3​O4​+3SO2​
  • Stage 2: the oxide produced is heated with carbon to form cobalt and carbon dioxide
a.

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

[1]
b.

Complete the equation for the reaction in stage 2.

Co3O4+‾C→‾Co+‾CO2 \text{Co}_3\text{O}_4 + \underline{\quad\quad} \text{C} \rightarrow \underline{\quad\quad} \text{Co} + \underline{\quad\quad} \text{CO}_2 Co3​O4​+​C→​Co+​CO2​
[1]
c.

Nickel is another transition metal adjacent to cobalt.

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

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

[1]
d.

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

[2]
e.

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

Write a chemical equation for this reaction.

[2]

Extraction and uses of metals Questions

  1. IGCSE
  2. /Chemistry
  3. /Extraction and uses of metals