a) Match the items of Column I with items of Column II.
Column I: i) Aluminium ii) Iron iii) Copper iv) Zinc
Column II: a) Malachite b) Bauxite c) Limestone d) Haematite e) Calamine (2)
b) The reduction of the metal oxide is easier if the metal formed is in liquid state, a

Question

a) Match the items of Column I with items of Column II.
Column I: i) Aluminium  ii) Iron  iii) Copper  iv) Zinc
Column II: a) Malachite  b) Bauxite  c) Limestone  d) Haematite  e) Calamine (2)
b) The reduction of the metal oxide is easier if the metal formed is in liquid state, at the temperature of reduction. Give reason. (1)

Accepted Answer

>

> [!TLDR]
> Aluminium's chief ore is bauxite, iron's is haematite, copper's is malachite, and zinc's is calamine. In an Ellingham diagram, a metal turning liquid during reduction gives a large increase in entropy, which makes the free-energy change more negative and favours reduction.
>
> **a) Matching ores to metals**
>
> i) Aluminium — b) Bauxite (Al2O3·2H2O)
> ii) Iron — d) Haematite (Fe2O3)
> iii) Copper — a) Malachite (CuCO3·Cu(OH)2)
> iv) Zinc — e) Calamine (ZnCO3)
>
> (Limestone, item 'c', is not an ore of any of these four metals — it is used as a flux in metallurgy, e.g. in the blast furnace, so it is left unmatched.)
>
> **b) Why reduction is easier when the metal formed is liquid**
> …

Q.a) Match the items of Column I with items of Column II.
Column I: i) Aluminium ii) Iron iii) Copper iv) Zinc
Column II: a) Malachite b) Bauxite c) Limestone d) Haematite e) Calamine

Concept understanding — Occurrence of Metals (Ores and Minerals)

Q.a) Match the items of Column I with items of Column II. Column I: i) Aluminium ii) Iron iii) Copper iv) Zinc Column II: a) Malachite b) Bauxite c) Limestone d) Haematite e) Calamine

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Q.a) Match the items of Column I with items of Column II.
Column I: i) Aluminium ii) Iron iii) Copper iv) Zinc
Column II: a) Malachite b) Bauxite c) Limestone d) Haematite e) Calamine

Unlock everything free for 14 days