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

The temperature of the slag zone in the metallurgy of iron using blast furnace is:

  1. 1200-1500$^0C$
  2. 1500-1600$^0C$
  3. 800-1000$^0C$
  4. more than 2000$^0C$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Slag is the fusible compound formed by the combination of flux and gangue.


$\underset{Flux}{CaO}+\underset{Gangue}{SiO _2} \rightarrow \underset{Slag}{CaSiO _3}$

At the temperature of the slag zone in the metallurgy of iron using blast furnace is $800^oC – 1000^oC$.

Option (C) is correct.

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