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The Thermit process is used for repairing cracks in railway tracks on site.

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The Thermit process is used for repairing cracks in railway tracks on site.

(a) Write the equation for the reaction taking place in the process, mentioning the physical states of the reactants and products. 

(b) What information in the chemical equation indicates that the reaction is exothermic?

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(a) Physical state of the reactants and products

2Al (s) + Fe2O3 (s) → 2 Fe (l) + Al2O3 (s)

(b) The iron formed is in the molten(liquid) state due to the heat generated in the reaction.

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