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Q.

Aluminothermy used for the spot welding of large iron structures is based upon the fact that

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a

Reaction between iron oxide and aluminium is endothermic

b

As compared to iron, aluminium has greater affinity for oxygen

c

Reaction between aluminium and oxygen is endothermic

d

As compared to aluminium, ironhas greater affinity for oxygen

answer is A.

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Detailed Solution

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Aluminothermy used for the spot welding of large iron structures is based upon two facts 
(i) As compared to iron, aluminum has greater affinity for oxygen. hence, aluminum acts are reducing agent.
(ii) Reaction between iron oxide and aluminum is exothermic. High temperature is involved in the reaction.
Aluminum reduces iron oxide to iron. 

Fe2​O3​+2Al→2Fe+Al2​O3​

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Aluminothermy used for the spot welding of large iron structures is based upon the fact that