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Chemistry

Thermite mixture is used to weld the broken ends of the iron girders. This mixture consists of ferric oxide and aluminium powder, which, when heated, produces molten iron. In this reaction, the aluminium powder acts as a/an …………… agent.

  1. oxidising
  2. reducing
  3. dehydrating
  4. corroding

Metallurgy

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Answer

reducing

Reason — When a mixture of aluminium powder and ferric oxide is ignited, the ferric oxide is reduced to metal. This process is called aluminothermy. Here, Aluminium acts as a powerful reducing agent.

Fe2O3+2Al2Fe+Al2O3+heat\text{Fe}2\text{O}3 + 2\text{Al} \rightarrow \text{2Fe} + \text{Al}2\text{O}3 + \text{heat}

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