Tag: occurrence of metals

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

The ore that can be concentrated by magnetic separation method is:

  1. bauxite $(Al _{2}O _{3}.xH _{2}O)$
  2. pyrolusite $(MnO _{2})$
  3. cuprite $(Cu _{2}O)$
  4. zincite $(ZnO)$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ore that can be concentrated by magnetic separation method is pyrolusite $(MnO _{2})$.
In this method, the ferromagnetic and non-magnetic particles in the ore are separated by an electromagnetic separator.

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

The waste, or slag, that comes out at the bottom of a blast furnace for making iron from its ore, is no thrown away. It is used for making?

  1. Dental powder

  2. Roads

  3. Plastics

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

Solution:- (B) Roads

Slag is valuable raw material for preparation of macadam materials and mineral blinders serving as a base for asphalt concrete mixture and manufacturing of cement emulsions, which are widely used in road paving.

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

Match the columns.

List I List II
A. Bauxite $1.$ Lead
B. Haematite $2.$ Thorium
C. Galena $3.$ Aluminium
D. Monazite $4.$ Iron
  1. $A - 3, B - 1, C - 4, D - 2$
  2. $A - 4, B - 2, C - 1, D - 3$
  3. $A - 3, B - 4, C - 1, D - 2$
  4. $A - 2, B - 4, C - 3, D - 1$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Solution:- 

(A) Bauxite $\rightarrow \left( {Al} _{2}{O} _{3}.2{H} _{2}O \right)$ It is an ore of Aluminium containing $15-20 \%$ aluminium. $\rightarrow$ (3) Aluminium
(B) Haematite $\rightarrow \left({Fe} _{2}{O} _{3} \right)$ A reddish-black mineral consisting of ferric oxide. It is an important ore of iron. $\rightarrow$ (4) Iron
(C) Galena $\rightarrow \left( PbS \right)$ Galena, also called lead glance, is the natural mineral form of lead(II) sulfide. $\rightarrow$ (1) Lead
(D) Monazite $\rightarrow$ Monazite is an important ore for thorium, lanthanum, and cerium. It is radioactive due to the presence of thorium. $\rightarrow$ (2) Thorium

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

Pig iron can be converted into steel by removing a lot of carbon contained in it, in a/ an:

  1. electrolytic chamber

  2. bessemer converter

  3. blast furnace

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

Solution:- (B) bessemer converter

The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace. The key principle is removal of impurities from the iron by oxidation with air being blown through the molten iron.

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

Calcium silicate slag formed in extraction of iron :

  1. prevents the reoxidation of molten iron.

  2. catalyses the combustion of carbon
  3. reduces $CO _2$ to $CO$ at the bottom of the furnace

  4. is used in cement industry
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

Slag formed in extraction of iron is consists of $CaSiO _3$ which is further used for making cement.
Also, formation of this slag prevents the re-oxidation of molten iron.