The reaction used to join railway tracks involves reducing agent:

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Solution

The correct option is C Al
Reaction used to join railway track is:
$F e_{2} O_{3} + 0 A l ⟶ + 3 A l_{2} O_{3} + 2 F e$
$↓$ $↑$
{Increase of Oxidation number: Oxidation}
Since, $A l$ undergoes Oxidation so it is a reducing agent.

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The reaction used to join railway tracks involves reducing agent:

The correct option is C AlReaction used to join railway track is:Fe2O3+0Al⟶+3Al2O3+2Fe ↓ ↑ {Increase of Oxidation number: Oxidation}Since, Al undergoes Oxidation so it is a reducing agent.

The correct option is C Al
Reaction used to join railway track is:
$F e_{2} O_{3} + 0 A l ⟶ + 3 A l_{2} O_{3} + 2 F e$
$↓$ $↑$
{Increase of Oxidation number: Oxidation}
Since, $A l$ undergoes Oxidation so it is a reducing agent.