A) aluminium powder
B) zinc powder
C) potassium metal
D) sodium metal
Correct Answer: A
Solution :
Thermite is a mixture of \[F{{e}_{2}}{{O}_{3}}\] and \[Al\]. This reaction involves reduction of \[F{{e}_{2}}{{O}_{3}}\]to \[Fe\] by \[Al\] and the reaction is highly exothermic due to which Fe obtained is in molten form. Thus this reaction can be used for welding purposes. In this \[F{{e}_{2}}{{O}_{3}}\] and \[Al\] are mixed in 3:1 ratio. \[F{{e}_{2}}{{O}_{3}}+2Al\xrightarrow{{}}A{{l}_{2}}{{O}_{3}}+2Fe(l)+\Delta \] (Thermite process)
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