Tag: general principles of metallurgy

Quizzes (6) Questions (151)

Questions Related to general principles of metallurgy

Multiple choice chemistry general principles of metallurgy extraction of copper and zinc extraction of copper and zinc from their oxides basics of metallurgy

Can we store copper sulphate in iron container and why?

  1. No, because Cu is more reactive than iron

  2. No, because iron is more reactive than copper, therefore reaction will take place.

  3. Yes, because copper is less reactive than iron.

  4. Yes, because copper is more reactive than iron.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$Fe + CuSO _4\rightarrow FeSO _4 + Cu$
Reaction has taken place because Fe is more reactive than Cu, therefore we cannot store.

Multiple choice chemistry general principles of metallurgy extraction of copper and zinc extraction of copper and zinc from their oxides basics of metallurgy

Which process use in smelting during metallurgy of coper

  1. Self reduction of copper
  2. $Cu _2S$ is converted into $Cu _2O$
  3. $FeS$ convert into $FeO$
  4. Reduction of $Fe$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Smelting of Cu result in slag formation and matle formation
FeS+Cu2O→FeP+Cu2SFeS+Cu2O→FeP+Cu2S
FCO+SiO2→FesiO3FCO+SiO2→FesiO3(slage)

Multiple choice chemistry general principles of metallurgy extraction of copper and zinc extraction of copper and zinc from their oxides basics of metallurgy

$2Cu _{2}S + 3O _{2}(g)\xrightarrow {heat} {a} + {b}$

In the reaction above $a$ and $b$ are:

  1. $a = 2Cu _{2}O, b = 2SO _{2}$
  2. $a = 4CuO _{2}, b = 2SO _{3}$
  3. $a = 2CuO, b = 4SO _{2}$
  4. $a = 3CuS, b = 2SO _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$2Cu _{2}S + 3O _{2} (g)\xrightarrow {\triangle} 2Cu _{2}O + 2SO _{2}(g)$
$2Cu _{2}O + Cu _{2}S\xrightarrow {\triangle} 6Cu(S) + SO _{2}(g)$.

Multiple choice chemistry general principles of metallurgy extraction of copper and zinc extraction of copper and zinc from their oxides basics of metallurgy

The balance reaction involved during extraction of zinc from its ore by roasting of zinc ore :

  1. $ZnS (s) + O _{2} \xrightarrow{Heat} ZnO(s) + 2SO _{2}(g)$
  2. $ZnS (s) + 3O _{2} \xrightarrow{Heat} ZnO(s) + 2SO _{2}(g)$
  3. $2ZnS (s) + 3O _{2} \xrightarrow{Heat} 2ZnO(s) + 2SO _{2}(g)$
  4. $ZnS (s) + 3O _{2} \xrightarrow{Heat} 2ZnO(s) + SO _{2}(g)$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The balanced chemical reaction for extraction of zinc from its ore by roasting of zinc ore is;

$2ZnS(s)+3{ O } _{ 2 }\xrightarrow { heat } 2ZnO(s)+2S{ O } _{ 2 }(g)$

Multiple choice chemistry general principles of metallurgy extraction of copper and zinc extraction of copper and zinc from their oxides basics of metallurgy

Aluminium and copper are extracted from their oxide and sulphide ores respectively. Which of the following is correct ? 
I. Copper is extracted by the auto reduction of copper oxide by copper sulphide.
II. Aluminium cannot be obtained by chemical reduction due to its strong affinity for oxygen.
III. In electrometallurgy of $Al$, graphite is used as cathode to avoid reoxidation of $Al$ into $Al _2O _3$ by preventing formation of $O _2$.
IV. Sulphide ores of copper are difficult to be reduced than the oxide ores.

  1. $I , II ,IV$
  2. $II$ and $III$
  3. $III$
  4. $II$ and $IV$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the electrometallurgy of $Al$, graphite is used as anode as oxygen being a non-metal is liberated at the anode and the reoxidation of $Al$ into $Al _2O _3$ is avoided.

Multiple choice chemistry general principles of metallurgy extraction of copper and zinc extraction of copper and zinc from their oxides basics of metallurgy

Which of the following steps correctly depicts the self-reduction of $Cu _2S$ to $Cu$?

  1. Roasting

  2. Smelting

  3. Bessemeriztion

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

In the extraction of copper, the self-reduction reaction of Copper taking place in a Bessemer converter is as follows:


$2Cu _{2}S+3O _{2} \rightarrow 2Cu _2O+2SO _{2}$

$Cu _{2}S+2Cu _{2}O\rightarrow 6Cu+SO _{2}$ (self reduction)

Option C is correct.