General Awareness · Geography

Minerals and Ores

1,167 Questions

Minerals and ores encompass the extraction, identification, and economic significance of naturally occurring crystalline substances. Topics cover specific ores like cinnabar and bauxite, alongside global mineral resource distribution. Candidates preparing for general awareness and geography sections should review these questions to master regional and global mineral reserves.

Ore identificationMineral extractionGlobal mineral reservesIndustrial minerals

Minerals and Ores Questions

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

The flux used in the extraction of iron:

  1. limestone

  2. silica

  3. coconut oil

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

Coke, limestone flux, and iron ore are charged into the top of the furnace in a precise filling order which helps control gas flow and the chemical reactions inside the furnace. Hence, The flux used in the extraction of iron is limestone. 

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

Which of the following ores cannot be concentrated by magnetic separation?

  1. Haematite

  2. Malachite

  3. Magnetite

  4. Siderite
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Magnetic separation based on differences in magnetic properties of the ore components.
  •  If either the ore or the gangue is attracted towards the magnetic field, then the separation is carried out by this method. 
  • For example, iron ores are attracted towards the magnet, hence, non–magnetic impurities can be separated from them using magnetic separation.
  • Here, Haematite, Magnetite, and Sidderite are iron ores and hence magnetic separation can be used to separate them.
  • Malachite is a Copper ore and hence magnetic separation can't be used to concentrate it.
Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

Which of the following ores is concentrated by chemical leaching method?

  1. Cinnabar

  2. Argentite

  3. Copper pyrites

  4. Galena
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • In the metallurgy of silver , the respective metal is eached with a dilute solution of NaCN or KCN in the presence of air, which supplies $O _2$. The metal is obtained later by replacement reaction.
  • The reactions involved are-
$4Ag+8CN^{-}+2H _2O+O _2 \rightarrow 4[M(CN) _2]^{-}+4OH^{-}$

$2[Ag(CN) _2]^{-}+Zn \rightarrow [Zn(CN) _4]^{2-}+2Ag$
  • Hence, Argentite being an ore of SIlver is concenrated by leaching.
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

 Name the metal which are associated with the following term in their extraction from their ores. Magnetic separation:

  1. tin stone and chromite ore

  2. copper stone and chromite ore

  3. tin stone and iron ore

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
 This method is adopted when either ore or the impurities are magnetic in nature. They are separated from each other by means of magnetic separators. Eg: $SnO _2$ (Non magnetic) in $Fe _3O _4$ (magnetic)
Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

Which of the following ore is best concentrated by froth flotation method ?

  1. Galena

  2. Cassiterite

  3. Magnetite

  4. Zinc blende
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

Galena ($PbS$) and zinc blende ($ZnS$) are sulphide ores. Cassiterite $SnO _{2}$ (oxide ore), and Magnetite $Fe _{3}O _{4}$ (oxide ore) are not sulphide ore. The froth flotation process is used to concentrate sulphide ores, based on preferential wetting properties with frosting agent and water.

Hence option $A$ and $D$ are correct.

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

Minerals from which metals can be preferably extracted are called :

  1. Ores

  2. Source

  3. Alloy

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

$\Rightarrow$ Minerals occur naturally in the Earth.

$\Rightarrow$ The minerals from which the metals are extracted without loss is called ores.
Example:
Many minerals are there for Aluminium extraction. But Bauxite extraction is of low cost. So Bauxite is only called ore of Aluminium. But remaining are only minerals.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

Which of the following are found as carbonate ore in nature?

  1. $Fe$
  2. $Mg$
  3. $Zn$
  4. $Pb$
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

 Carbonate ores are Magnesite $(MgCO _3)$, Dolomite $(CaCO _3MgCO _3)$, Calamine $(ZnCO _3)$, Malachite $(CuCO _3.Cu (OH) _2)$, Siderite $(FeCO _3)$, and Limestone $(CaCO _3)$.

A principal ore of lead is galena $(PbS)$.