Tag: in the land of kerala

Questions Related to in the land of kerala

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

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

  1. 1200-1500$^0C$

  2. 1500-1600$^0C$

  3. 800-1000$^0C$

  4. more than 2000$^0C$

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Correct Option: C
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.

Handpicking method is effective in:

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

  1. solid mixtures

  2. liquid mixtures

  3. gaseous mixtures

  4. all of them

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Correct Option: A
Explanation:

Hand picking is effective in solid mixtures as the impurities, that we want to separate are visible to eye.

Which metallurgy involves leaching?

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

  1. $Au$

  2. $Ag$

  3. Both (a) and (b)

  4. None of these

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Correct Option: C
Explanation:

Gold and silver are extracted from their native ores by leaching. Leaching involves the treatment of the ore with suitable reagent as to make it soluble while impurities remain insoluble.

Stainless steel contains:

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

  1. $Fe,Ni,Cr$

  2. $Fe,Ni,Sn$

  3. $Fe,C,S$

  4. $Fe,P,Cr$

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Correct Option: A
Explanation:

Iron, Nickel, Chromium

A solution is a homogeneous mixture of two or more substances. Which of the following is a solution?

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

  1. Milk

  2. Smoke

  3. Brass

  4. Face Cream

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Correct Option: C
Explanation:

Alloys are the homogeneous mixture of metals or metals and non metals. Brass is an alloy of copper and zinc
Brass $Cu-70$%
$Zn-30$%
Alloys are solid-solid solution

Heating a pyrite in air to remove sulphur is known as:

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

  1. smelting

  2. roasting

  3. bessemerisation

  4. calcination

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Correct Option: B
Explanation:

Roasting is a process of heating of sulphide ore to a high temperature in the presence of air. It is a step of the processing of certain ores.


Hence, option B is correct.

Which of the following is the ore of $Cu$?

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

  1. Ciderite

  2. Magnetite

  3. Calamine

  4. Malachite

Show answer
Correct Option: D
Explanation:

Ore of copper is malachite $CuCO _{3}.Cu(OH) _{2}$.

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

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

  1. bauxite $(Al _{2}O _{3}.xH _{2}O)$

  2. pyrolusite $(MnO _{2})$

  3. cuprite $(Cu _{2}O)$

  4. zincite $(ZnO)$

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Correct Option: B
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.

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?

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

  1. Dental powder

  2. Roads

  3. Plastics

  4. Glass moulds

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Correct Option: B
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.

Match the columns.

List I List II
A. Bauxite $1.$ Lead
B. Haematite $2.$ Thorium
C. Galena $3.$ Aluminium
D. Monazite $4.$ Iron
geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  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. $A - 2, B - 4, C - 3, D - 1$

Show answer
Correct Option: C
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