Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al₂O₃ + Fe
(b) MnO₂ + Al
(c) Fe₂O₃ + Al
(d) Cu₂O + Fe

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Solution

(c) ${Fe}_{2} O_{3} + Al$
In this thermite reaction, iron (III) oxide and aluminium powder are combined and heated. Iron oxide gets reduced to iron by the action of reducing agent aluminium and produces excess heat. The molten iron produced is poured in the middle of the broken pieces of irons that are fixed mutually.

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${F e}_{2} O_{3}$ + $A l$ $\to$ $F e$ + ${A l}_{2} O_{3}$ + $h e a t$
This is the reaction used in thermite welding process. Calcium can also be used instead of aluminium in this process.

${F e}_{2} O_{3}$ + $A l$ $\to$ $F e$ + ${A l}_{2} O_{3}$
This is the reaction used in thermite welding process. Calcium can also be used instead of aluminium in this process.

Q. Thermite welding is carried out for iron by taking aluminium. Which properties of aluminium are exploited for the above purpose?

Q. Assertion :In thermite welding, aluminium powder and

F e_{2} O_{3}

are used. Reason: Aluminium powder is a strong reducing agent.

You are given an Ellingham diagram (deliberately not shown). It is given that for almost all practically achievable temperatures, the $F e \to F e_{2} O_{3}$ line lies above the $A l \to A l_{2} O_{3}$ line and $Δ_{f} G^{\circ}$ for both $A l_{2} O_{3}$ and $F e_{2} O_{3}$ are negative. Which of the following statements is/are true?

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Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks? (a) Al2O3 + Fe (b) MnO2 + Al (c) Fe2O3 + Al (d) Cu2O + Fe

Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al₂O₃ + Fe
(b) MnO₂ + Al
(c) Fe₂O₃ + Al
(d) Cu₂O + Fe