Tag: general principles of metallurgy

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Questions Related to general principles of metallurgy

Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

Leaching is commercially carried out for in the concentration of:

  1. galena

  2. argentite

  3. copper pyrites

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

Leaching is a process in which the ore is dissolved in a suitable solvent, where the impurities remain undissolved. This method is used in the extraction of $Ag$ from Argentite where is, the ore is dissolved in sodium cyanide solution.

Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

Which of the following method used for the concentration of copper pyrites?

  1. Magnetic seperation

  2. Gravity seperation

  3. Froth Floatation process

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
This method is used when a higher ore contains impurities with higher density. This method is used for the concentration of Sulphide ores. (Eg: Copper pyrites, iron pyrites, Galena, Zinc blende etc.) Copper is mainly extracted from copper pyrites. After the concentration of its ore by froth flotation process, the ore is roasted in a current of air to remove arsenic, antimony and much of sulphur.
Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

Which of the following process is used for concentration of ore?

  1. Froth flotation

  2. Electrolytic methods

  3. Smelting

  4. Hoop's process
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Froth flotation method is used for the concentration of sulphide ores. 


The method is based on the preferential wetting properties with the frothing agent and water. In the given options, Galena (PbS) is the only sulphide ore.

Hence, option A is correct.

Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

During concentration of Tin stone separation of wolframates of $Fe^({II})$ and $Mn^({II})$ is based on the fact that:

  1. $SnO _2$ is paramagnetic
  2. $SnO _2$ is diamagnetic
  3. $FeWO _4$ and $MnWO _4$ are paramagnetic

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During concentration of Tin stone separation of wolframates of $Fe({II})$ and $Mn({II})$ is based on the fact $SnO _2$ is diamagnetic and both $FeWO _4$ & $MnWO _4$ are paramagnetic so magnetic separation method is used for concentration of ore.

Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

Which compound is used to separate two metal sulphide in forth flotation process :

  1. $ Na _2CO _3 $

  2. KCI

  3. NaCN
  4. $ (SCN) _2 $
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

NaCN (Sodium Cyanide) is used as a depressant in the froth flotation of sulphide ores to prevent one specific sulphide (like ZnS) from floating while allowing another (like PbS) to float.

Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

The ore which do not contain iron is:

  1. Limonite

  2. Siderite

  3. Carnallite

  4. Chalcopyrites
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
1) Limonite $\rightarrow Fe _2 O _3 . 3H _2O$

2) Siderite $\rightarrow FeCO _3$

3) Carnallite $\rightarrow KCl . MgCl _2 . 6 H _2O$

4) Chalcopyrites $\rightarrow CuFeS _2$

Therefore carnallite does not contain iron.

Hence, the correct option is $\text{C}$
Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

Silver is displaced when zinc is added to aqueous sodium argento cyanide.This method os extracting silver is an example for 

  1. Leaching

  2. Hydro metallurgy

  3. Pyrometallurgy

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

Hydrometallurgy involves the extraction of metals from their ores using aqueous solutions. The displacement of silver from a cyanide solution by zinc is a classic example of this process.