Class 12ChemistryGeneral Principles and Processes of Isolation of ElementsMix Examples of General Principles and processes of Isolation of Elements
MediumConsider the following:
Statement-$I$ : In the extraction of $Al$ by Hall-Heroult process,pure $Al_2O_3$ mixed with $Na_3AlF_6$ lowers its melting point and increases conductivity.
Statement-$II$ : Zirconium metal is purified by zone refining method.
Statement-$I$ : In the extraction of $Al$ by Hall-Heroult process,pure $Al_2O_3$ mixed with $Na_3AlF_6$ lowers its melting point and increases conductivity.
Statement-$II$ : Zirconium metal is purified by zone refining method.
- ABoth statement-$I$ and statement-$II$ are correct
- BBoth statement-$I$ and statement-$II$ are not correct
- CStatement-$I$ is correct,but statement-$II$ is not correct
- DStatement-$I$ is not correct,but statement-$II$ is correct
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Similar Questions
In which of the following metals extraction,impurities are removed as slag?
$i.$ $Al$ $\quad$ $ii.$ $Fe$
$iii.$ $Cu$ $\quad$ $iv.$ $Zn$
The correct option is
$i.$ $Al$ $\quad$ $ii.$ $Fe$
$iii.$ $Cu$ $\quad$ $iv.$ $Zn$
The correct option is
Write the uses of alloys.
Easy
View SolutionIdentify the correct statements from the following:
$I$. Brass is an alloy of copper and nickel
$II$. Bronze is an alloy of copper and zinc
$III$. German silver is an alloy of copper,zinc and nickel
$IV$. Brass is an alloy of copper and zinc
$I$. Brass is an alloy of copper and nickel
$II$. Bronze is an alloy of copper and zinc
$III$. German silver is an alloy of copper,zinc and nickel
$IV$. Brass is an alloy of copper and zinc
Extraction of copper from copper pyrite $CuFeS_2$ involves:
$A$. Crushing followed by concentration of the ore by froth-flotation
$B$. Removal of iron as slag
$C$. Self-reduction step to produce 'blister copper' following evolution of $SO_2$
$D$. Refining of 'blister copper' by carbon reduction
$A$. Crushing followed by concentration of the ore by froth-flotation
$B$. Removal of iron as slag
$C$. Self-reduction step to produce 'blister copper' following evolution of $SO_2$
$D$. Refining of 'blister copper' by carbon reduction
Match the items of List-$I$ with those of List-$II$ and choose the correct option given below.
List-$I$ List-$II$ $A$. Calcination $1$. Galena $B$. Roasting $2$. Magnetite $C$. Magnetic separation $3$. Pyrometallurgy $D$. Carbon reduction of metal oxide $4$. Malachite
| List-$I$ | List-$II$ |
| $A$. Calcination | $1$. Galena |
| $B$. Roasting | $2$. Magnetite |
| $C$. Magnetic separation | $3$. Pyrometallurgy |
| $D$. Carbon reduction of metal oxide | $4$. Malachite |
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