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Standard X

Chemistry

Extraction of Iron

When iron ore...

Question

When iron ore is reduced in a blast furnace, some of the $S i O_{2}$ impurity is also reduced by reaction with carbon to give elemental silicon and carbon monoxide. The silicon is subsequently reoxidised in basic oxygen process, and the resulting $S i O_{2}$ reacts with $C a O$ , yielding slag. What is the formula of slag?

C a_{2} S i O_{2}

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C a S i O_{3}

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C a S i O_{4}

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None of these

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Solution

The correct option is B $C a S i O_{3}$
Reactions of the process are

$S i O_{2} (s) + 2 C (s) \to S i (s) + 2 C O (g)$

$S i (s) + O_{2} (g) \to S i O_{2} (s)$

$C a O (s) + S i O_{2} (s) \to C a S i O_{3} (l) (s l a g)$

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Similar questions

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Q. The equations of the production of iron in the blast furnace are given. Answer the following questions.

C + O_{2} \to C O_{2}

C O_{2} + C \to 2 C O

C a C O_{3} \to C a O + C O_{2}

C a O + S i O_{2} \to C a S i O_{3}

F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}

Write the chemical equation of the formation of slag in blast furnace.

Q. Assertion :Limestone added in the blast furnace decomposes to give

C a O

which forms slag in the molten state and separates out from iron. Reason: The iron obtained from the blast furnace contains about 4% carbon and many impurities like

S, P, S i, M n,

etc.

Q. How many reactions can show slag formation process from the given reactions ?
(i)

S i O_{2} + C a O \to C a S i O_{3}

(ii)

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

(iii)

C a O + P_{2} O_{5} \to C a_{3} (P O_{4})_{2}

(iv)

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

(v)

M g C O_{3} + S i O_{2} \to M g S i O_{3} + C O_{2}

When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO. The flux added to form slag is

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The correct option is B CaSiO3Reactions of the process areSiO2(s)+2C(s)→Si(s)+2CO(g)Si(s)+O2(g)→SiO2(s)CaO(s)+SiO2(s)→CaSiO3(l)(slag)

The correct option is B $C a S i O_{3}$
Reactions of the process are

$S i O_{2} (s) + 2 C (s) \to S i (s) + 2 C O (g)$

$S i (s) + O_{2} (g) \to S i O_{2} (s)$

$C a O (s) + S i O_{2} (s) \to C a S i O_{3} (l) (s l a g)$