Question

State the property of the metal utilized in Aluminium in Thermite welding.

August 10, 2024

Answer

Aluminium is a strong reducing agent and has a strong affinity for oxygen. It reduces Fe₂O₃, to Fe which fills the gap. Hence it is used for thermite (Fe₂O₃) welding.

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Name the following : (i) A metallic ore converted to it’s oxide – iron [II] oxide on heating the concentrated ore.
(ii) A black metallic oxide reduced to metal on heating with coke.
(iii) The compound which on ignition at elevated temperatures gives pure alumina.
(iv) The non-metal which forms the anode during electrolytic reduction of fused alumina in Hall Heroult’s process.
(v) A metal other than manganese, present in duralumin but not in magnalium.

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The metallic oxide reduced to metal generally by thermal decomposition.
(a) ZnO
(b) MgO
(c) HgO
(d) Al2O3

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The process of dressing of the ore which involves separation of ore & gangue due to preferential wetting.
(a) Magnetic separation
(b) Hydrolytic method
(c) Froth flotation method
(d) Chemical method

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The chemical name of the main ore of aluminium.
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(b) Aluminium oxide
(c) Sodium aluminium fluoride
(d) Hydrated aluminium oxide

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The common name of the ore of iron whose chemical formula is Fe3O4.
(a) Iron pyrites
(b) Magnetite
(c) Haematite
(d) Spathic iron ore

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The oxide of the metal which reacts with both acids and alkalis to give salt & water.
(a) MgO
(b) CuO
(c) Al2O3
(d) K2O

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State (i) composition (ii) reason for alloying (iii) one use of each of the following alloys.
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(v) Stainless steel

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Give reasons for the following pertaining to Hall Herault’s process.
(i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction.
(ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar.
(iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes.
(iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.

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State the function of (i) Sodium hydroxide (ii) Cryolite (iii) Fluorspar in the metallurgy of aluminium in Hall Herault’s process.

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Question

State the property of the metal utilized in Aluminium in Thermite welding.

Answer

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