Tag: basics of metallurgy

Questions Related to basics of metallurgy

Lead is extracted from its chief ore galena by both carbon reduction as well as self-reduction.
chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

  1. True

  2. False

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Correct Option: A
Explanation:

$2PbS+3O _2\rightarrow 2PbO+2SO _2$
$PbS+2PbO\rightarrow 3Pb+SO _2$ (self reduction)
$PbO+C\rightarrow Pb+CO$
$PbO+CO\rightarrow Pb+CO _2$ (carbon reduction)

Identify the metal $M$ whose extraction is based on the following reactions:
$MS+2{ O } _{ 2 }\longrightarrow M{ SO } _{ 4 }$
$2MS+3{ O } _{ 2 }\longrightarrow 2MO+2S{ O } _{ 2 }$
$MS+2MO\longrightarrow 3M+S{ O } _{ 2 }$
$MS+M{ SO } _{ 4 }\longrightarrow 2M+2S{ O } _{ 2 }\quad $

chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

  1. magnesium

  2. aluminium

  3. lead

  4. tin

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Correct Option: A

Which of the following oxides cannot be reduced to metal by carbon?

chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

  1. $ZnO$

  2. $Al _2O _3$

  3. $CuO$

  4. $CaO$

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Correct Option: B,D
Explanation:

Generally carbon is more reactive than $Zn$ and $Cu$. Hence, $ZnO$ and $CuO$ can be reduced by carbon leading to the formation of corresponding metals,  but carbon is less reactive than $Ca$ and $Al$, so $CaO$ and $Al _2O _3$ can not be reduced by carbon .