Question

The ratio of $Fe _{2} O _{3}$ 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 $Fe _{2} O _{3}$ and $Al$.
In thermite, the ratio of $Fe _{2} O _{3}$ and $Al$ is $3: 1$ by weight.
$Fe _{2} O _{3}+2 Al \rightarrow 2 Fe + Al _{2} O _{3}$
Due to great affinity of aluminium towards oxygen, it readily combines with oxygen.