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Extraction of Iron

Identify the ...

Question

Identify the correct equations representing thermite reduction.

A

C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r

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B

A l_{2} O_{3} + 2 F e \to F e_{2} O_{3} + 2 A l

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C

2 A g + F e_{2} O_{3} \to A g_{2} O + 2 F e

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D

3 M n_{3} O_{4} + 8 A l \to 4 A l_{2} O_{3} + 9 M n

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Solution

The correct options are
A $C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r$
D $3 M n_{3} O_{4} + 8 A l \to 4 A l_{2} O_{3} + 9 M n$
Thermite process or Goldschmidt process is the method of obtaining liquid metal by reduction of the oxide with aluminium powder. When ignited with magnesium ribbon, it reacts with the oxide, producing the metal and aluminium oxide, at an intensely high temperature approaching 3000 degrees Celsius.
Eg: $C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r$
$3 M n_{3} O_{4} + 8 A l \to 4 A l_{2} O_{3} + 9 M n$

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Similar questions

10 g

A l

is used for reduction in each of the following alumino thermic reactions, which reaction would generate more heat and by how much ?
a.

2 A l + C r_{2} O_{3} \to A l_{2} O_{3} + 2 C r

2 A l + F e_{2} O_{3} \to A l_{2} O_{3} + 2 F e

Standard heat of formation of

A l_{2} O_{3}

C r_{2} O_{3}

F e_{2} O_{3}

- 1676 k J

- 1141 k J

- 822.2 k J

, respectively.

F e_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 F e

The above reaction is an example of:

Q. For the reaction

2 A l + F e_{2} O_{3} ⟶ 2 F e + A l_{2} O_{3}

, the standard heat enthalpy of

F e_{2} O_{3}

A l_{2} O_{3}

- 196.5

- 399.1

kcal respectively.

Δ H^{\circ}

for the reaction is:

Q. In the reaction,

F e_{2} O_{3} + 2 A l \to 2 F e + A l_{2} O_{3} +

h e a t

, the substance that is oxidised is ____________ and the substance that is reduced is _____________.

Δ H_{f}^{\circ}

F e_{2} O_{3}

A l_{2} O_{3}

are -189 kJ and -405 kJ respectively. How much heat (in kJ) is given out during reaction of 1 g Al according to

2 A l + F e_{2} O_{3} ⟶ A l_{2} O_{3} + 2 F e

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