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Q.
The ratio of $ F{{e}_{2}}{{O}_{3}} $ and Al, in thermite is:
MGIMS WardhaMGIMS Wardha 2003
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) $