Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
$(a) A l_{2} O_{3} + F e (b) M n O_{2} + A l (c) F e_{2} O_{3} + A l (d) C u_{2} O + F e$

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Solution

(c) $F e_{2} O_{3} + A l$
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. Assertion :Statement- I : Thermite mixture

{F e}_{2} O_{3}

+ Al (powder) is used in the welding. Reason: Statement- II : Al is a good reductant

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

Aluminium is used in thermite welding:

(a) What is thermit?

(b) What is ignition mixture?

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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?
$(a) A l_{2} O_{3} + F e (b) M n O_{2} + A l (c) F e_{2} O_{3} + A l (d) C u_{2} O + F e$