Tag: study of kerala

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

The flux used in the extraction of iron:

  1. limestone

  2. silica

  3. coconut oil

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

Coke, limestone flux, and iron ore are charged into the top of the furnace in a precise filling order which helps control gas flow and the chemical reactions inside the furnace. Hence, The flux used in the extraction of iron is limestone. 

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

Specific gravity of slag is always:

  1. much greater than the molten metal

  2. less than the molten metal

  3. same as molten metal

  4. more or less the metal depending on the metal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In blast furnace, products are collected at bottom. So, molten metal should be at bottom and slag is at up. So slag should have low density compared to molten metal.

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

Here an extraction process is given in steps. Identify the suitable ores corresponding to the process.
Pulverisation $\rightarrow$ Calcination $\rightarrow$ Smelting $\rightarrow$ Vacuum $\rightarrow$ Distillation

  1. Zinc blend

  2. Calamine

  3. Magnesite

  4. Zincite
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Zinc Sulphide and Calamine responds for the process because, in $ZnS$, only zinc comes at smelting and after process, high purity comes after distillation. similar to Calamine, after distillation, the metal obtained is pure.

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.