A) 1 : 3
B) 1 : 2
C) 3 : 1
D) none of these
Correct Answer: C
Solution :
Thermite is the mixture of\[F{{e}_{2}}{{O}_{3}}\]and\[Al\]. Due to great affinity of aluminium towards oxygen, it readily combines with oxygen. Hence Goldsmith used\[Al\]to reduce metal oxides in extraction. In thermite, the ratio of\[F{{e}_{2}}{{O}_{3}}\]and \[Al\]is taken 3 : 1 by weight. \[F{{e}_{2}}{{O}_{3}}+2Al\to 2Fe+A{{l}_{2}}{{O}_{3}}\] \[(2\times 56+3\times 16=160)\text{ }(2\times 27=54)\]
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