Which of the following is incorrectly matched?

  • A
    Polling - Purification of $Cu$
  • B
    Cupellation - Purification of $Ag$
  • C
    Smelting - Oxidation process
  • D
    Roasting - Oxidation process

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Similar Questions

Identify the alloy containing a non-metal as a constituent in it.

The correct statement$(s)$ related to the metal extraction processes is(are):
$(A)$ $A$ mixture of $PbS$ and $PbO$ undergoes self-reduction to produce $Pb$ and $SO_2$.
$(B)$ In the extraction process of copper from copper pyrites,silica is added to produce copper silicate.
$(C)$ Partial oxidation of sulphide ore of copper by roasting,followed by self-reduction produces blister copper.
$(D)$ In the cyanide process,zinc powder is utilized to precipitate gold from $Na[Au(CN)_2]$.

Match the following:
List-$I$List-$II$
$A. Al_2O_3 + 2NaOH + 3H_2O \rightarrow 2Na[Al(OH)_4]$$I. \text{Roasting}$
$B. Ni(CO)_4 \xrightarrow{230^{\circ}C} Ni + 4CO$$II. \text{Calcination}$
$C. Fe_2O_3 \cdot 3H_2O \xrightarrow{\Delta} Fe_2O_3 + 3H_2O$$III. \text{Vapour phase refining}$
$D. 2PbS + 3O_2 \rightarrow 2PbO + 2SO_2$$IV. \text{Electrolysis}$
$V. \text{Leaching}$

The correct answer is:

Metals are extracted by other methods through the formation of complexes. The complexes formed in these methods are: $I$: Cyanide process,$II$: Mond process,$III$: Photographic fixing process.

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Match List $I$ with List $II$.
List $I$ List $II$
$A$. Reverberatory furnace $I$. Pig Iron
$B$. Electrolytic cell $II$. Aluminum
$C$. Blast furnace $III$. Silicon
$D$. Zone Refining furnace $IV$. Copper

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