$A l_{2} O_{3}$ formation involves evolution of a large quantity of heat, so we use $A l$ :

as deoxidiser

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Solution

The correct option is D in thermite welding
Theory Based. It has been given that a very large amount of heat is produced in this reaction. This heat can be used to melt metals which can thus be used in thermite welding.

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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.

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

Q. In thermite welding, to ignite the mixture we use :

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

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

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Al2O3 formation involves evolution of a large quantity of heat, so we use Al:

The correct option is D in thermite weldingTheory Based. It has been given that a very large amount of heat is produced in this reaction. This heat can be used to melt metals which can thus be used in thermite welding.

$A l_{2} O_{3}$ formation involves evolution of a large quantity of heat, so we use $A l$ :

The correct option is D in thermite welding
Theory Based. It has been given that a very large amount of heat is produced in this reaction. This heat can be used to melt metals which can thus be used in thermite welding.