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(a) Which metal is extracted from bauxite ore?(b) Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
(c) Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
(d) Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.
(e) Name a common metal which is highly resistant to corrosion.
(a) Aluminium is extracted from bauxite ore.
(b) Haematite is the ore of iron. Iron (III) oxide is present in it. Fe2O3 is its chemical formula.
(c) Zinc sulphide (zinc blende ore) is strongly heated in the air (roasted), it forms zinc oxide and sulphur dioxide. This process is called roasting.
$2Zn(s) + 3O_2(g) → 2ZnO(s) + 2SO_2$
Zinc oxide is heated with carbon to form zinc metal. This is a reduction step.
$ZnO(s) + C(s) → 2ZnO(s) + 2SO_2(g)$
(d) The galvanised iron article is protected against rusting even if the zinc layer is broken as zinc is more easily oxidized than iron. Therefore, it continues to corrode while the iron layer is protected.
(e) Aluminium is highly resistant to corrosion.
Updated on: 10-Oct-2022
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