The ratio of $F e_{2} O_{3}$ and Al, in thermite is:

1 : 3

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1 : 2

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3 : 1

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none of the above

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Solution

The correct option is C $3 : 1$
Thermite is the mixture of $F e_{2} O_{3}$ and Al. In thermite, the ratio of $F e_{2} O_{3}$ and Al is $3 : 1$ by weight.
$F e_{2} O_{3} + 2 A l \to 2 F e + A l_{2} O_{3}$
Due to great affinity of aluminium towards oxygen, it readily combines with oxygen.

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Similar questions

Q. The ratio of

F e_{2} O_{3}

and

A l

by weight, in thermite is about:

Iron oxides $F e_{2} O_{3}$ can be reduced by $A l$ in the Goldschmidt thermite process.

Q. an intimate mixture of ferric oxide and aluminium is used as solid rocket fuels.calculate fuel value per gram and fuel value per cc of the mixture.heats of formation and densities are as follows;

dHf al2o3= 399 kcal/mole
dhf fe2o3=199kcal/mole density of fe2o3=5.2g/cc density of al=2.7gm/cc

soln;-
2al +3/2 o2 -->al2o3 eq 1
2fe + 3/2 o2---- fe2o3 eg 2
2al +fe2o3= al2o3 + 2fe

1*eq 1 - 1*eq 2
dh=-399-(-199)
= -200 kcal

fuel value/gram
2 moles of al + 1 mol fe2o3
2*27 + 1 * 160
214gm

; fuel value /gram = 200/214= 0.93kcal/gm
fuel gram/ cc
2 mole of al= 54/2.7= 20cc
1 mole of fe2o3 = 214/5.2=30.7cc // here ,1 mole of fe2o3 = 160 ...... and 214gm is the sumation of both al
and fe2o3 ..... while if we multiply 30.7*5.2 =159.64 which is near about 160

Q. Which of the following options represents the reducing agent and the substance that gets oxidised during a thermite reaction?

Option	Substance oxidised	Reducing agent
A	Al	Fe
B	${A l}_{2} O_{3}$	Al
C	Al	Al
D	${F e}_{2} O_{3}$	Fe

[1 mark]

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

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The ratio of Fe2O3 and Al, in thermite is:

The correct option is C 3:1Thermite is the mixture of Fe2O3 and Al. In thermite, the ratio of Fe2O3 and Al is 3:1 by weight.Fe2O3+2Al→2Fe+Al2O3Due to great affinity of aluminium towards oxygen, it readily combines with oxygen.

The ratio of $F e_{2} O_{3}$ and Al, in thermite is:

The correct option is C $3 : 1$
Thermite is the mixture of $F e_{2} O_{3}$ and Al. In thermite, the ratio of $F e_{2} O_{3}$ and Al is $3 : 1$ by weight.
$F e_{2} O_{3} + 2 A l \to 2 F e + A l_{2} O_{3}$
Due to great affinity of aluminium towards oxygen, it readily combines with oxygen.