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Doctors Medicines MCQs Q&A

  1. Coke
  2. cementite
  3. coal
  4. bauxite
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1 Answers

Option 1 : Coke

The correct answer is Coke.

Concept:

Coke

  • Coke is a high-carbon product obtained by the the destructive refining of coal.
  • Coke has a high carbon content, to the point where it is said to be a nearly pure form of carbon.
  • Coke is a hard, permeable strong with greyish-dark shading.

Uses of Coke

  • Coke is most commonly used as a fuel for ovens, blacksmithing and heaters.
  • It is occasionally preferred over coal because it produces very little smoke.
  • It is also used to produce iron in an impact heater.
  • Coke is used to make steel and a variety of other materials.

Explanation:

  • At extremely high temperatures, blast furnaces are used to produce iron from iron ore.
  • Iron ore is extracted from the earth's crust, which contains a variety of impurities.
  • Coke is used along with iron ore and limestone to produce iron in a modem blast furnace.
  • The Blast Furnace is used to chemically reduce the concentrated ore to its liquid metal state.
  • A blast furnace is a massive steel stack lined with bricks, into which concentrated iron ore, coke, and limestone are fed from the top and a blast of hot air is blown.
  • All three components are crushed into small round pieces, mixed, and placed on a hopper that regulates the input.
  • By burning coke in the lower portion of the furnace, a blast of hot air is blown from the bottom of the furnace, raising the temperature to around 2200K.
  • The burning of coke, therefore, supplies most of the heat required in the process.
  • The CO and heat move to the upper part of the furnace. 
  • The temperature is lower in the upper part, and the iron oxides (Fe2O3 and Fe3O4) from the top are gradually reduced to FeO.
  • At 900 – 1500 K, the reaction between coke and carbon dioxide occurs in the lower sections of the furnace.

C + CO2 → 2CO
3FeO + CO2 → Fe + CO2

  • Blast furnaces are used to convert iron ore into iron. 
  • There are various types of iron ores present, such as limonite and iron pyrites.
  • Metallurgy is the process of converting an ore into a metal. 
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Related Questions

In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1 - Along the road walked an old man.   P - He was white-headed as a mountain, bowed in the shoulders, and faded in general aspect.   Q- He wore a glazed hat, an ancient boat-cloak, and shoes; his brass buttons bearing an anchor upon their face.   R - One would have said that he had been, in his day, a naval officer of some sort or other   S - In his hand was a silver-headed walking-stick, which he used as a veritable third leg, perseveringly dotting the ground with its point at every few inches’ interval.   6 - Before him stretched the long, laborious road, dry, empty, and white.?
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