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Mond's Process

Which of foll...

Question

Which of following reaction is not an example of thermite reaction?

A

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

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B

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

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C

2 H g O + H g S ⟶ 3 H g + S O_{2}

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D

2 C u_{2} S + 3 O_{2} ⟶ 2 C u_{2} O + 2 S O_{2}

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Solution

The correct options are
C $2 H g O + H g S ⟶ 3 H g + S O_{2}$
D $2 C u_{2} S + 3 O_{2} ⟶ 2 C u_{2} O + 2 S O_{2}$
Thermite process is the reduction of metal oxides with aluminum powder in which a huge amount of heat is liberated is called thermite process.

Thermite process is very useful for the welding of broken metal parts. When Aluminum powder reacts with iron oxide or chromium oxide and manganous oxide, a large amount of heat is released and about a temperature of $3500^{o} C$ is attained which is enough to weld broken metallic parts.
So options A,B are thermite reactions.
Hence options C & D are correct

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Similar questions

List I	List II
A. Calcination	a. $2 {C u}_{2} S + 3 O_{2} \to 2 {C u}_{2} O + 2 S O_{2}$
B. Roasting	b. ${F e}_{2} O_{3} \cdot n H_{2} O \to {F e}_{2} O_{3} + n H_{2} O$
C. Flux	c. ${C r}_{2} O_{3} + 2 A l \to {A l}_{2} O_{3} + 2 C r$
D. Thermite	d. $S i O_{2} + F e O \to F e S i O_{3}$

Match the following.

Q. Some of the reactions taking place during bessemerisation possibly are -

A : F e O + S i O_{2} \to F e S i O_{3}

B : 2 F e S + 3 O_{2} \to 2 F e O + 2 S O_{2}

C : 2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}

D : 2 C u_{2} O + C u_{2} S \to 6 C u + S O_{2}

Select reactions actually taking place :

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

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

Q. The enthalpies of formation of

A l_{2} O_{3}

C r_{2} O_{3}

are -1596 kJ and -1134 kJ respectively.

Δ H

for the reaction,

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

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.

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