Question

. In thermite welding a mixture of …… and …… is ignited with a burning magnesium ribbon which produces molten iron metal as large amount of heat is evolved.

1 point

(a) iron (III) oxide and aluminium powder

(b) iron (II) oxide and aluminium powder

(c) iron (III) chloride and aluminium powder

(d) iron (III) sulphate and aluminium powder

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Answer 1

Thermite welding also known as exothermic welding and the reaction of metal oxide and aluminium powder reaches very high temperature. The activation energy for this reaction is very high and the initiation requires the use of a booster material such as powder magnesium metal.

Answer 2

(a) iron (III) OXIDE AND ALUMINIUM POWDER