Tag: basics of metallurgy

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

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 $

  1. magnesium

  2. aluminium

  3. lead

  4. tin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The given roasting and auto-reduction reactions are classic steps in the extraction of lead (Pb) from galena (PbS). Lead sulfide reacts with oxygen to form lead sulfate and lead oxide, which then react further with remaining sulfide to yield molten lead and sulfur dioxide.

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

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

  1. $ZnO$
  2. $Al _2O _3$
  3. $CuO$
  4. $CaO$
Reveal answer Fill a bubble to check yourself
B,D Correct answer
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 .