(C) Statement-$I$ is correct. In the Hall-Heroult process,pure $Al_2O_3$ has a very high melting point and is a poor conductor of electricity. Adding

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Statement-$I$ is correct,but statement-$II$ is not correct

(C) Statement-$I$ is correct. In the Hall-Heroult process,pure $Al_2O_3$ has a very high melting point and is a poor conductor of electricity. Adding $Na_3AlF_6$ (cryolite) and $CaF_2$ (fluorspar) lowers the melting point of the mixture and increases its electrical conductivity.Statement-$II$ is incorrect. Zirconium $(Zr)$ is purified by the Van Arkel method,which involves the formation of a volatile iodide $(ZrI_4)$ followed by its thermal decomposition. Zone refining is typically used for semiconductors like $Si$ and $Ge$.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Mix Examples of General Principles and processes of Isolation of Elements

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Consider 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.

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Both statement-$I$ and statement-$II$ are correct
B
Both statement-$I$ and statement-$II$ are not correct
C
Statement-$I$ is correct,but statement-$II$ is not correct
D
Statement-$I$ is not correct,but statement-$II$ is correct

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General Principles and Processes of Isolation of Elements

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Mix Examples of General Principles and processes of Isolation of Elements

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Match the conversions in Column-$I$ with the type$(s)$ of reaction$(s)$ given in Column-$II$.

Column-$I$ Column-$II$

$A$. $PbS \rightarrow PbO$ $p$. roasting

$B$. $CaCO_3 \rightarrow CaO$ $q$. calcination

$C$. $ZnS \rightarrow Zn$ $r$. Carbon reduction

$D$. $Cu_2S \rightarrow Cu$ $s$. self reduction

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Which of the following is a non-ferrous alloy?

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Solder is an alloy of

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$A$ metal $(M)$ exists in oxide form. Its oxide cannot be reduced by carbon up to $800\, ^\circ C$,but it can be reduced by $Al$ even below $800\, ^\circ C$. Select the correct Ellingham diagram for metal $(M)$.

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In the equation: $M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^- + 4OH^{-}$,metal $M$ is

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Column-$I$	Column-$II$
$A$. $PbS \rightarrow PbO$	$p$. roasting
$B$. $CaCO_3 \rightarrow CaO$	$q$. calcination
$C$. $ZnS \rightarrow Zn$	$r$. Carbon reduction
$D$. $Cu_2S \rightarrow Cu$	$s$. self reduction

Consider 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.

Similar Questions

Which of the following is a non-ferrous alloy?

Solder is an alloy of

$A$ metal $(M)$ exists in oxide form. Its oxide cannot be reduced by carbon up to $800\, ^\circ C$,but it can be reduced by $Al$ even below $800\, ^\circ C$. Select the correct Ellingham diagram for metal $(M)$.

In the equation: $M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^- + 4OH^{-}$,metal $M$ is

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Consider 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.