Tag: in the land of kerala

Questions Related to in the land of kerala

Unwanted material with ore is called as ______ .

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

  1. Gangue

  2. Rust

  3. Slag

  4. Silica

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Correct Option: A
Explanation:

Ores contain some impurities in the form of clay or rocky material known as gangue.

The process of extraction of metal from its ores, is known as :

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

  1. concentration

  2. calcination

  3. purification

  4. metallurgy

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Correct Option: D
Explanation:

The process of extracting metals from their ores is called as metalurgy.The process employed in the extraction of the ore depends on the nature of the ore and the impurities present in it.The following are the basic steps for a metallurgical operation;

  1. Crushing and grinding of the ore.
  2. Concentration of the ore 
  3. Working of the ore 
  4. Purification or refining of the metal

The extraction of metals from their ores and then refining them for use is known as................. .

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

  1. metallurgy

  2. extacting

  3. metal technology

  4. none of these

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Correct Option: A
Explanation:

Metallurgy is the science of extracting metals from their ores and modifying the metals for use. It is a commercial method.

Which of the following pairs is incorrect?

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

  1. Gneiss - Metamorphic

  2. Rock salt - Sedimentary

  3. Dolerite - Igneous

  4. Dolomite - Igneous

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Correct Option: D
Explanation:

Dolomite is a sedimentary rock. Therefore, the incorrect match is option D

Process in which the extraction of metals from ores is called:

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

  1. metallurgy

  2. mining

  3. refining

  4. none of these

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Correct Option: A
Explanation:

The process containing the extraction or refining of metals is known as metallurgy.

In metallurgy, the concentration of ore is followed by the dressing of ore.

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

  1. True

  2. False

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Correct Option: B
Explanation:
Dressing of ore is followed by concentration of ore. 
Steps of metallurgy  are:
  • Crushing of the ore
  • Concentration of ore also known as Dressing of the ore
  • Conversion of concentrated ore to oxide 
  • Reduction of oxide to metal 
  • Refining of metal or Purification
Phosphorus mostly exists in free state.
geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. True

  2. False

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Correct Option: B
Explanation:

The given statement is false.
Phosphorus does not exists in free state. It mostly exists in combined state. It occurs in the minerals of apetite family such as fluorapatite $\displaystyle Ca _9[PO _4] _6CaF _2$ which is main constituent of phosphate rocks. Phosphorous is essential constituent of animal and plant matter.

Which of the following oxides react to form slag in open hearth process?

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

  1. $CaO,CO$

  2. ${ P } _{ 2 }{ O } _{ 4 }, CaO$

  3. ${ P } _{ 2 }{ O } _{ 5 }, Si{ O } _{ 2 }$

  4. $CaO, { CO } _{ 2 }$

Show answer
Correct Option: A
Explanation:
${CaCO _3} _{(s)}\longrightarrow CaO _{(s)}+{CO _2} _{(g)}$
$SiO _2+CaO \longrightarrow {CaSiO _3} _{(slag)}$
The calcium oxide formed by the decomposition reacts with various acidic impurities in the iron (mainly silica) to form slag which is essentially calcium silicate $(CaSiO _3)$ .

Which metal is obtained as by-products during metallurgy of Lithium ?

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

  1. Rubidium

  2. Caesium

  3. Both Rubidium and Caesium

  4. None of the above

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Correct Option: B

Identify $x,\ y \ and \ z$ for the following metallurgical process :


$Metal\ sulphide\overset { x }{ \rightarrow  } Metal\ oxide\overset { y }{ \rightarrow  } Impure\ metal$

$x,\ y$ and $z$ are respectively :

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

  1. roasting, smelting, electrolysis

  2. roasting, calcination, smelting

  3. calcination, auto-reduction, basemerisation

  4. None of the above

Show answer
Correct Option: A
Explanation:

Roasting $\rightarrow $ It is a process in metallurgy
in which sulphide are is heated in 
air and transforms into oxides.

Smelting $\rightarrow $ It is a process of extracting
a base metal from corresponding
metal oxides.

electrolysis $ \rightarrow $ It is used in metallurgical
process, such as in extraction or purification
of metals from ores or compounds.

Therefore, the correct option is A.