Tag: thermodynamic principles of metallurgy

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Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Which of the following processes involves the smelting process?

  1. $ZnCO _3 \rightarrow ZnO + CO _2$
  2. $2PbS +3O _2 \rightarrow 2PbO + 2SO _2$
  3. $Fe _2O _3 + 3C \rightarrow 2Fe + 3CO$
  4. $Al _2O _3.2H _2O \rightarrow Al _2O _3 + 2H _2O$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In smelting, Iron ore is reduced to iron.

$Fe _{2}O _{3}+3C{\rightarrow}Fe+3CO$

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Which of the following methods is not involved in metallurgy of iron?

  1. Calcination

  2. Smelting

  3. Concentration of ore

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
(1) Calcination is the process in which the ore is heated below its melting point, either in the absence or in a limited supply of air, in an aim to drive off volatile expunges, moisture, water of hydrates and organic matter from the ore. All ores are minerals but all minerals are not ores.

(2)Smelting is a process when a metal which is more reactive than copper needs to be extracted. For example, zinc is more reactive than copper so it has to be extracted by smelting.

(3)Ores are solid material from which a pure metal can be obtained. The process of removal of unwanted material from the ore is known as concentration or dressing or benefaction of ores.

So Calcination, Smelting, Concentration of ore all the processes used in metallurgy.
Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Iron is an essential nutrient for plants, which absorb it from the soil. Iron deficiency is often found in wet, clayey soils that have a high content of:

  1. carbonate

  2. chloride

  3. phosphate

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

Iron and carbon occurs combinedly. Iron ore contains carbon percentage more. In clay, wet soils carbon content is more. So, Iron deficiency is there. In reactions carbon changes to carbonate.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Iron is used in different forms, like, cast iron, steel, and alloys. The iron-carbon diagram is the basis for the branch of science known as:

  1. ferrous metallurgy

  2. stereochemistry

  3. carbon metallurgy

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

The percentage of Iron and Carbon determine whether it is cast Iron, Pig Iron, Steel or Alloys. Hence this is known as Ferrous Metallurgy. The main contribution is given by Iron as every type of Iron contains more than 90% of Iron.

Multiple choice thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

Magnetic ceramics or ferrites contain compounds of iron. These have been used:

  1. in panels for solar cells

  2. as memory elements in computers

  3. for building water-desalinators on ships

  4. for making transformers
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnetic ceramics or ferrites are used to store computer data in the residual magnetic fields of hard ferrite cores.