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Standard X

Chemistry

Smelting

Name the flux...

Question

Name the flux to remove the impurity of $S i O_{2}$ .

P_{4} O_{10}

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C a O

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N_{2} O_{5}

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{A l}_{2} O_{3}

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Solution

The correct option is C $C a O$
Flux: The substance which is added to remove the gangue from the concentrated ore in its molten state is called Flux and the substance formed with flux is called Slag. Slags are generally silicates.

Acidic Flux
$S i O_{2} + C a O \to C a S i O_{3}$
Acidic flux removes basic impurities.

Basic Flux
$S i O_{2} + M g O \to M g S i O_{3}$
Basic flux removes acidic impurities

Thus, in given options, $C a O$ is the flux to remove impurities in $S i O_{2}$ .

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Similar questions

Q. In aluminium extraction by the Bayer process, alumina is extracted from bauxite by sodium hydroxide at high temperatures and pressures.

{A l}_{2} O_{3} (s) + 2 O H^{-} (a q) \to 2 A l O_{2}^{-} (a q) + H_{2} O (l)

Solid impurities such as

{F e}_{2} O_{3}

and

S i O_{2}

are removed and then

A l {(O H)}_{4}^{-}

is reprecipitated

2 A l {(O H)}_{4}^{-} ⟶ {A l}_{2} O_{3} \cdot 3 H_{2} O (s) + 2 O H_{(a q)}^{-}

.
In the industrial world __________.

Q. If an ore contains impurity of

S i O_{2}

, identify the appropriate flux for the removal of it:

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

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

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.

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Name the flux to remove the impurity of SiO2.

Name the flux to remove the impurity of $S i O_{2}$ .