Question

The ratio of $F{e}_2{O}_3$ and Al, in thermite is:

• A. 1 : 3
• B. 1 : 2
• C. 3 : 1
• D. none of these

Answer 1

Answer: (C)

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. $F{e}_2{O}_3+2Al\to 2Fe+A{l}_2{O}_3$ $(2\times 56+3\times 16=160)(2\times 27=54)$