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 replacing parts of speech transformation of sentences english

Rewrite using the verb form of the underlined noun:

Steel gains strength from the addition of nickel.

  1. Steel is strengthened by the addition of nickel.

  2. Steel becomes strong when nickel is added.

  3. Steel is strengthify by the addition of nickel.

  4. Steel strengthfully adds nickel up.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Strengthened is the verb form of strength. So, Option A is correct. Words like strengthify and strengthfully don't exist. And Strong is an adjective. Thus, the rest of the options cancel out.

Multiple choice chemistry chemical changes electrochemical reactions electrolysis and its applications electrolytic cells and electrolysis

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:

  1. in the presence of NaCl.

  2. in the presence of fluoride.

  3. in the presence of cryolite which forms a melt with lower melting temperature.

  4. in the presence of cryolite which forms a melt with higher melting temperature.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pure alumina melts at about $ 2000^{0}C$ and is a bad conductor of electricity so fused cryolite and fluorspar is added to lower the melting point and the mixture melts at $ 900^0C$.

Multiple choice chemistry chemical changes electrochemical reactions electrolysis and its applications electrolytic cells and electrolysis

During the purification of copper by electrolysis:

  1. the anode used is made of copper ore

  2. pure copper is deposited on the cathode
  3. the impurities such as $Ag,\space Au$ present in solution as ions
  4. concentration of $CuSO _4$ solution remains constant during dissolution of $Cu$
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation
Anode : - Impure copper or crude copper.
Cathode : Pure copper
Electrolyte : $15\%$ $CuSO _{4}$ solution $+5\%$ $H _{2} SO _{4}$
When electric current is passed through the electrolyte, the angle anode gradually dissolve and pure copper is deposited on the cathode which gradually grow in size. The impurities like, Fe,Zn,Ni, etc, dissolved in the solution as  while gold, silver, platinum settle down the anode as anode mud.
Reaction Occurring are as follows.
$CuSO _{4}\rightleftharpoons Cu^{+2}+SO _{4}^{-2};$ At anode : $Cu-2e\rightarrow Cu^{+2}$
                                                Cathode : $Cu^{+2}+2e\rightarrow Cu$
Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

For the manufacture of cement various steps are given below. Arrange the steps in a proper sequence.


(a) Clinker formation                            (b) Crushing
(c) Addition of gypsum                         (d) Mixing of raw materials
(e) Grinding to fine powder                  (f) Calcination in rotary kiln

  1. d b f a c e

  2. b d f c e a

  3. d c a f e b

  4. a b c d e f
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The order of steps followed in the formation of cement is :
(i) Mixing of raw materials $(d)$
(ii) Crushing $(b)$
(iii) Calcination in a rotary kiln $(f)$
(iv) Clinker formation $(a)$
(v) Addition Gypsum $(c)$
(vi) Grinding to line powder $(e)$


Hence, the correct option is $(A)$.
Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

When metal foundry products are cleaned by shot blasting, heat is generated by friction. Nitrogen is used for:

  1. providing an inert atmosphere

  2. cooling the blast chamber

  3. reducing friction

  4. displacing hot air
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Nitrogen commonly used as inert gas to create inert atmosphere because the strong triple bond needs a lot of energy to break and participate in a reaction. Hence, ${N} _{2}$ is referred as an inert gas.
Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Copper sulphate dissolved in water can be recovered as solid by:

  1. Evaporation

  2. Filtration

  3. Centrifugation

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

Evaporation is used to separate a soluble solid from a liquid. For example, copper sulfate is soluble in water its crystals dissolve in water to form copper sulfate solution. During evaporation, the water evaporates away leaving solid copper sulfate crystals behind.

Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

Which of the following is not a method of refining of metals?

  1. Electrolysis

  2. Smelting

  3. Poling

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

Smelting is process in which metal is extracted from its ore by heating and melting. It is not a method of refining metal. Methods of refining metals are electrolysis poling, liquation, zone refining, vapour phase refining, distillation.

Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

Which one of the following is the true in electrolytic refining?

  1. Impure metal is made cathode.

  2. Impure metals is made anode.

  3. Impure metals is made cathode and pure metal as anode.

  4. Both electrodes must be of pure metal.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • In Electrolytic refining, the impure metal is made to act as an anode. A strip of the same metal in pure form is used as a cathode. 
  • They are put in a suitable electrolytic bath containing a soluble salt of the same metal. 
  • The more basic metal remains in the solution and the less basic ones go to the anode mud.
  • Zinc, copper is refined by this method.
Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

Four metals and their methods of refinement are given
(i) $Ni,\ Cu,\ Zr,\  Ga$
(ii) Electrolysis, van Arkel process, zone refining, Mond's process
Choose the right method for each:

  1. $Ni:$ Electrolysis, $Cu:$ van Arkel process, $Zr:$ Zone refining, $Ga:$ Mond's process
  2. $Ni:$ Mond's process, $Cu:$ Electrolysis, $Zn:$ van Arkel process, $Ga:$ Zone refining
  3. $Ni:$ Mond's process, $Cu:$ van Arkel process, $Zr:$ Zone refining, $Ga:$ Electrolysis
  4. $Ni:$ Electrolysis, $Cu:$ Zone refining, $Zr:$ van Arkel process, $Ga:$ Mond's process
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$Ni$ is refined by Mond's process.

$Cu$ is refined by Electrolysis.
$Zn$ is refined by Van Arkel process.
$Ga$ is refined by Zone refining.

Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

Mark the correct statements:

(i) mercury can be refined by the process of distillation.

(ii) In poling, the molten impure metal is stirred with green poles of wood.

(iii) In electrolyte refining of metals, impure metal is made as cathode and a thin strip of pure metal is made as anode.

  1. (i) and (ii)

  2. (i) and (iii)

  3. (ii) and (iii)

  4. (i), (ii) and (iii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Low boiling point metals like Mercury are purified with distillation.

Hence,  statement (i) is correct.
 
The heat of  copper makes the pole emit wood gas that reduces the cuprous oxide to copper.
In poling, the molten impure metal is stirred with green poles of wood.
Hence,option (ii) is correct.

In electrolyte refining of metals, impure metal is made as Anode  and a thin strip of pure metal is made as cathode.
Hence, option (iii) is incorrect.

Multiple choice chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

Electrolysis is used for refining certain metals such as copper and zinc.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrolysis, process by which electric current is passed through a substance to effect a chemical change. The chemical change is one in which the substance loses or gains an electron (oxidation or reduction).

It is extensively used in metallurgical processes, such as in extraction (electrowinning) or purification (electrorefining) of metals from ores or compounds and in deposition of metals from solution (electroplating). Electrolysis of salt of copper and zinc results in the deposition of pure copper and zinc on cathode of the electrolytic cell.
option A is correct

Multiple choice chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

In the electrolytic refining of a metal M, what would you take as the anode is : 

  1. impure metal M

  2. thin strip of pure metal M

  3. solution of salt of the metal M

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

The purest copper is obtained by an electrolytic process using impure copper as the anode and a thin sheet of pure copper as cathode. The electrolyte is an acidic solution of copper sulphate. By passing electricity copper is dissolved from anode and deposits at cathode.

Multiple choice chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

On the basis of following features identify the correct option:
I. This metal is not obtained in free state.
II. This metal is obtained by electrolysis of their chlorides in molten state.

  1. $Na$
  2. $Ca$

  3. both (1) and (2)

  4. neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both Sodium and calcium are highly reactive metal oxides are not reduced by carbon and these metals are obtained in free state by electrolytic reduction of their molten chloride salts.

Multiple choice chemistry metals and non metals refining of metals basics of metallurgy basic metallurgical processes

In electrolytic refining, which one is the anode and which is cathode?

  1. Pure metal is the anode and impure metal is cathode

  2. Impure metal is made anode and pure metal cathode

  3. Both can be done interchangeably

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

In electrolytic refining, impure metal is made the anode and a thin strip of pure metal is made the cathode.