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Which of the following statements is incorrect?

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Which of the following statements is incorrect?

Cassiterite is an oxide ore of tin.

Tin metal is obtained by the carbon reduction of black tin (purified ore of tin).

In the extraction of lead from galena, the roasting and self-reduction are carried out in the same furnace at different temperatures.

Reducing agent of hematite in blase-furnace is coke in the upper part and CO in the lower part of the furnace.

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Text solutionVerified

(A)

Cassiterite

(S n O_{2})

is an oxide ore of tin.

(B)

Purified ore that contains

70%

S n O_{2}

is called black tin.

S n O_{2} + 2 C \to S n + 2 CO

(carbon reduction)

(C)

Roasting is done at moderate temperatures in the presence of air in a reverberatory furnace. Both roasting and self-reduction are carried out in the same furnace at different temperatures.

(D)

500 - 800

K (lower temperature range in the upper part of blast furnace),

CO

is the reducing agent.

3 F e_{2} O_{3} + CO \to 2 F e_{3} O_{4} + C O_{2}

F e_{3} O_{4} + 4 CO \to 3 F e + 4 C O_{2}

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

900 - 1500

K (higher temperature range in the lower part of blast furnace), coke is the reducing agent.

C + C O_{2} \to 2 CO; F e O + CO \to F e + C O_{2}

Hence, the statement in option D is incorrect.

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Question Text	Which of the following statements is incorrect?
Answer Type	Text solution:1
Upvotes	150

Which of the following statements is incorrect?

Text solutionVerified

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