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Q.

Reduction of metal oxides by thermit process becomes faster just after ignition. Why?

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Detailed Solution

Aluminium is used as reductant in thermit process and the process is highly exothermic.
Fe2O3 + 2Al →1000-1500°C Al2O3+2Fe
The ignition helps to overcome the energy of activitation and hence the reaction is fast.

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Reduction of metal oxides by thermit process becomes faster just after ignition. Why?