Chemistry · Science General

Metallurgical Processes

1,403 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 adsorption and colloids adsorption theory of heterogeneous catalysis enzymes and catalysts catalysis

In which of the following processes, a catalyst is not used? 

  1. Haber's process and Deacon's process

  2. Deacon's process and Solvay process

  3. Solvay process and Lead chamber process

  4. None of these can proceed without catalyst
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Haber's process catalyst is finely divided iron

Deacon's process catalyst is copper chloride

Solvay process catalyst is ammonia-soda

Lead chamber process catalyst is platimnum.

So in the all above process is catalyst is used.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Magnesium oxide is used for the lining in steel making furnace because:

  1. $MgO$ acts as an acidic flux to remove impurities of $Si,\ P$ and $S$
  2. $MgO$ acts as a basic flux to remove impurities of $Si,\ P$ and $S$
  3. $MgO$ acts as an oxidising agent to remove impurities of oxides
  4. $MgO$ does not react with any type of impurities
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The impurities of the furnace are acidic. So to remove them, basic fluxes are added to remove it as slag.


Example: $MgO+SiO _2\rightarrow MgSiO _3$
                                                 slag

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

During the formation of the slag by the reaction of flux and impurities which of the following is an example of acidic and basic flux?
(i) $FeO + SiO _2\rightarrow FeSiO _3$
(ii) $SiO _2+MgO\rightarrow MgO\rightarrow MgSiO _3$

  1. (i) $SiO _2$ - Acidic flux (ii) $MgO$ - Basic flux
  2. (i) $SiO _2$ - Basic flux (ii) $MgO$ - Acidic flux
  3. (i) $SiO _2$ - Basic flux (ii) $MgO$ - Basic flux
  4. (i)$ SiO _2$ - Acidic flux (ii) $MgO$ - Acidic flux
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
i) $FeO+Si{ O } _{ 2 }\longrightarrow FeSi{ O } _{ 3 }$
In it $Si{ O } _{ 2 }$ is acidic flux and used to remove basic impurities.
ii) $Si{ O } _{ 2 }+MgO\longrightarrow MgSi{ O } _{ 3 }$
$Si{ O } _{ 2 }$ is acidic impurity. $MgO$ is basic flux used to remove $MgSi{ O } _{ 3 }$ as slag.
Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Impurities of sulphur, silicon, and phosphorus can be removed from cast iron by adding:

  1. carbon which reduces the impurities

  2. water which dissolves the impurities

  3. limestone which changes impurities into oxides and pass into slag

  4. iron oxide which reacts with impurities by forming slag
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Flux is added to remove impurities as slag. So impurities like Sulphur, Silicon and Phosphorous are removed from case Iron by adding flux. Here flux is $CaC{ O } _{ 3 }$

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

In the extraction of some metals from their ores, coke can be used as:

  1. Oxidizing agent

  2. Reducing agent

  3. Catalyst

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

Metals below carbon in the reactivity series can be extracted using carbon. Carbon reduces the metal oxides that are extracted when heated. 


For example, the common ores of iron are both iron oxides, and these can be reduced to iron by heating them with carbon in the form of coke. 

Hence, option B is correct.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

In metallurgy, reduction is one of the major steps. However, all ores may not require an extra reducing agent, one such metallurgical operation is the extraction of?

  1. Fe from magnetite

  2. Sn from cassiterite

  3. Hg from cinnabar

  4. Zn from zinc blende
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cinnabar (HgS) is an ore of mercury, which is a low-reactivity metal. Heating cinnabar in air readily reduces it to liquid mercury without needing an extra reducing agent because thermal decomposition alone is sufficient.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Various processes involved on the extraction of metals from their ores and refining are known as:

  1. concentration of ore

  2. enrichment of ore

  3. refining of ore

  4. metallurgy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To obtain a metal from its ore is called extraction of metal. The various process involved in the extraction of metals from the ores and refining are known as metallurgy.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

The process of extraction of metal from its ores, is known as :

  1. concentration

  2. calcination

  3. purification

  4. metallurgy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The process of extracting metals from their ores is called as metalurgy.The process employed in the extraction of the ore depends on the nature of the ore and the impurities present in it.The following are the basic steps for a metallurgical operation;

  1. Crushing and grinding of the ore.
  2. Concentration of the ore 
  3. Working of the ore 
  4. Purification or refining of the metal

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

In metallurgy, the concentration of ore is followed by the dressing of ore.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Dressing of ore is followed by concentration of ore. 
Steps of metallurgy  are:
  • Crushing of the ore
  • Concentration of ore also known as Dressing of the ore
  • Conversion of concentrated ore to oxide 
  • Reduction of oxide to metal 
  • Refining of metal or Purification
Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Identify $x,\ y \ and \ z$ for the following metallurgical process :


$Metal\ sulphide\overset { x }{ \rightarrow  } Metal\ oxide\overset { y }{ \rightarrow  } Impure\ metal$

$x,\ y$ and $z$ are respectively :

  1. roasting, smelting, electrolysis

  2. roasting, calcination, smelting

  3. calcination, auto-reduction, basemerisation

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

Roasting $\rightarrow $ It is a process in metallurgy
in which sulphide are is heated in 
air and transforms into oxides.

Smelting $\rightarrow $ It is a process of extracting
a base metal from corresponding
metal oxides.

electrolysis $ \rightarrow $ It is used in metallurgical
process, such as in extraction or purification
of metals from ores or compounds.

Therefore, the correct option is A.