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Reduction of Oxides

Assertion :In...

Question

Assertion :In smelting, the roasted ore is heated with powdered coke in presence of flux. Reason: Oxides are reduced to metals by $C$ or $C O$ and impurities are removed as slag.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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C

Assertion is correct but Reason is incorrect

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D

Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gasses or slag and leaving just the metal behind.The reducing agent is commonly a source of carbon such as coke.

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Similar questions

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

CaO

formed by decomposition of

{CaCO}_{3}

{SiO}_{2}

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Directions: In the following questions, a statement of assertion is followed by a statement of reason.
Mark the correct choice as:
Assertion: For acidic impurities like

S i O_{2}

present in an ore, basic fluxes are used.
Reason: Lime is a basic flux.

Q. Assertion: The compressibility factor for

H_{2}

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

H e

can be derived from Van der Waal's equation.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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