Chemistry · Science General

Metallurgical Processes

1,436 Questions

This section explores key metallurgical processes including ore concentration, pyrometallurgy, and metal refining. It also covers corrosion and the properties of refractory materials. These chemistry questions are relevant for engineering and science entrance tests.

Pyrometallurgy furnacesMetal refining techniquesCorrosion protection methodsOre concentrationAuto reduction process

Metallurgical Processes Questions

Multiple choice chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

Electro refining which is based on phenomenon of Electrolysis where:

  1. impure metal is made anode and pure metal is cathode

  2. impure metal is cathode and pure metal is anode

  3. pure metal makes both anode and cathode

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This method is based upon the phenomenon of electrolysis. The crude metal is made anode whereas the thin sheet of a pure metal is made cathode. The electrolyte is the solution of the soluble salt of the same metal, preferably a double salt on passing electricity the metal from anode goes into solutions as ions due to oxidation while the pure metal gets deposited at the cathode due to the reduction of metal ions the impurities settle down below the anode as Anode Mud.

Multiple choice chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

The main applications of electrolysis are:

  1. electroplating

  2. electrorefining

  3. extraction of metals

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The main application of electrolysis are:


Electroplating: Electroplating is a process of depositing a layer of any desired metal on another material by means of electricity.

Electrorefining: Electrorefining refers to the process of using electrolysis to increase the purity of a metal extracted from its ore.

Extraction of metals: Extractions are a way to separate the desired substance when it is mixed with others. 

Hence, option D is correct.

Multiple choice chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

Silver can be spread as a thin sheet on another metal by electroplating. The film of silver sticks strongly to the metal. Which of the following metals cannot be properly plated with silver?

  1. Copper

  2. Iron

  3. Nickel

  4. Brass
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iron cannot be property plated with silver it becomes peel if plated with silver are to peeling of silver it cannot properly plated iron.

Multiple choice chemistry chemical changes applications of electrolysis electroplating extraction of metals by electrolysis

In electroplating of copper by silver, the silver acts as an :

  1. anode

  2. cathode

  3. electrode

  4. electrolyte
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Silver plating on Steel spoon: A silver rod is made as anode and steel spoon as cathode. Potassiumargentocyanide $(K[Ag(CN) _2])$ is used as electrolyte.
$AgNO _3$ is not used as electrolyte because in that case the silver coating will be non-uniform as the electrolysis takes place rapidly.
In electroplating of copper by silver, silver rod is taken as anode.

Multiple choice chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

Why are metal pipes not an ideal means of transport for pure hydrogen?

  1. They become brittle

  2. They burst out

  3. The metals melt

  4. None of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pure hydrogen is the smallest element and some of it will inevitably escape from any known container or pipe in micro amounts. It causes the metal to become brittle, suggesting metal pipes may not be ideal for hydrogen transport.

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

Which of the following sulphides when  heated strongly in air gives the corresponding metal without undergoing separate reduction of oxide?

  1. $Cu _2S$
  2. $FeS$
  3. $HgS$
  4. $ZnS$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$2Cu _2S+3O _2\longrightarrow 2Cu _2O+2SO _2$

$2ZnS+3O _2\longrightarrow 2ZnO+2SO _2$
$2PbS+3O _2\longrightarrow 2PbO+2SO _2$
$2HgS+3O _2\longrightarrow 2HgO+2SO _2$
$FeS+O _2\longrightarrow Fe+SO _2$
$FeS$ when heated directly in air gives $Fe$. 

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

Which of the following reactions show the process of smelting?

  1. $2PbO + PbS \rightarrow 3Pb + SO _2$
  2. $2Na[Au(CN) _2]+Zn \rightarrow Na _2[Zn(CN) _4]+2Au$
  3. $PbO+C\rightarrow Pb + CO$
  4. $2HgS + 3O _2\rightarrow 2HgO+2SO _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon reduction occurs in smelting from oxide ore. $PbO+C\longrightarrow Pb+CO$

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

Fill in the blanks with the correct choice.
The undesired impurities present in the ores are called (i). To remove the volatile impurities from the ore, the (ii) process is carried out. Flux combines with non-fusible impurities to form (iii). $CaO$ acts as a (iv) flux.

  1. (i) - gangue, (ii) -roasting, (iii) - slag, (iv) -acidic

  2. (i) - gangue, (ii) - calcination, (iii) - slag, (iv) - basic

  3. (i) - anode mud, (ii) - leaching, (iii) - matrix, (iv) -acidic

  4. (i) - gangue, (ii) -roasting, (iii) - solution, (iv) -acidic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
$(i)$ The undesired impurities present in the ores are called gangue.
$(ii)$ To remove the volatile impurities from the ore calcination is carried out.
$(iii)$ Flux combines with non-fusible impurities to form slag.
$(iv)$ $CaO$ acts as basic flux.
Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

In the process of extraction of gold, Roasted gold ore$+CN^- _{(aq)}+H _2O\overset{O _2}{\rightarrow}[X]+[OH^-]$, $[X]+Zn\rightarrow [Y]+Au$
Identify the complexes [X] and [Y].

  1. $[Au(CN) _2]^-, [Zn(CN) _4]^{2-}$
  2. $[Au(CN) _4]^{3-}, [Zn(CN) _4]^{2-}$
  3. $[Au(CN) _2]^{2-}, [Zn(CN) _6]^{4-}$
  4. $[Au(CN) _4]^-, [Zn(CN) _4]^{2-}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
$4Au+8{ CN }^{ - }+2{ H } _{ 2 }O+{ O } _{ 2 }\longrightarrow 4{ \left[ Au{ \left( CN \right)  } _{ 2 } \right]  }^{ - }+4{ OH }^{ - }$
$2{ \left[ Au{ \left( CN \right)  } _{ 2 } \right]  }^{ - }+Zn\longrightarrow 2Au+{ \left[ Zn{ \left( CN \right)  } _{ 4 } \right]  }^{ 2- }$
It is Mc-Arthur process. Here
$X={ \left[ Au{ \left( CN \right)  } _{ 2 } \right]  }^{ - }$ & $Y={ \left[ Zn{ \left( CN \right)  } _{ 4 } \right]  }^{ 2- }$