Assertion -Iron oxide impurities are removed by adding calcium oxide- Reason- Basic impurities are removed by adding acidic flux-If both assertion and reason are correct and reason is the correct explanation of the assertion-If both assertion and reason are correct- but reason is not the correct explanation of assertion-If assertion is correct- but reason is incorrect-If assertion is incorrect- but reason is correct-

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Standard VIII

Chemistry

Non-Metals

Assertion :Ir...

Question

Assertion :Iron oxide impurities are removed by adding calcium oxide. Reason: Basic impurities are removed by adding acidic flux.

If both assertion and reason are correct and reason is the correct explanation of the assertion.

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If both assertion and reason are correct, but reason is not the correct explanation of assertion.

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If assertion is correct, but reason is incorrect.

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If assertion is incorrect, but reason is correct.

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Solution

The correct option is D If assertion is incorrect, but reason is correct.
All metal oxides are basic in nature and all nonmetal oxides are acidic in nature.
So if impurities are acidic then it can be removed by using a base and if impurities are basic then it can be removed by using acid.
In this question-Iron oxide is metal oxide so it is acidic and calcium oxide is also metal oxide so it is also acidic.Acidic impurities cannot be removed by acid so the assertion is false.
The reason is true.
So correct answer is $(D)$ .

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Similar questions

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. 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. 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.

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.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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