Aluminium is used in thermite welding because it:

is a light metal

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has more affinity for oxygen

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is strong oxidising agent

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is a reactive metal

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Solution

The correct option is C has more affinity for oxygen
Thermite welding of aluminium $⟶$ exothermic

$A l$ dust reduces the oxide of another metal, most commonly iron oxide. $A l$ is reacting

$⟶$ $A l$ has more affinity for oxygen.

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Aluminium is used in thermite welding:

(a) What is thermit?

(b) What is ignition mixture?

Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then metal is extracted from it by electrolytic reduction.

Mention one reason for the use of aluminium in thermite welding.

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