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Bihar Board Class 12 (Science) Extractive Metallurgy — practice questions

Explore 43 free Extractive Metallurgy questions in Bihar Board Class 12 (Science) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Extractive Metallurgy questions and exercises with answers

Showing questions 1–30 of 43.

Which medium does hydrometallurgy rely on to extract metals?Read the answer and worked solution →What is the first step of a hydrometallurgical process?Read the answer and worked solution →Pyrometallurgy is a branch of extraction that depends mainly on what?Read the answer and worked solution →Processes that produce molten products are collectively called what?Read the answer and worked solution →Which pair of operations typifies pyrometallurgical processes involving gases and solids?Read the answer and worked solution →In electro-refining, what is used as the anode?Read the answer and worked solution →In electrowinning, what anode is used while metal plates on the cathode?Read the answer and worked solution →In fused salt electrolysis, where does the valuable metal collect?Read the answer and worked solution →Which step marks the beginning of mineral processing of an ore?Read the answer and worked solution →What does concentrating an ore achieve?Read the answer and worked solution →Which method for concentrating ore uses differences in surface properties of minerals?Read the answer and worked solution →Which property does magnetic separation of an ore exploit?Read the answer and worked solution →What typically supplies the heat in roasting of sulfide ores?Read the answer and worked solution →Which process is still regarded as the prime technology for recovering gold from ores?Read the answer and worked solution →Which toxic metal do artisanal miners use to concentrate gold and silver?Read the answer and worked solution →Which of these is a lixiviant used in hydrometallurgy?Read the answer and worked solution →The final recovery of metal from a leach solution may involve which of these?Read the answer and worked solution →What chart helps predict the outcome of reactions in pyrometallurgy?Read the answer and worked solution →An Ellingham plot shows how which quantity varies with temperature?Read the answer and worked solution →Which quantity does an Ellingham plot show against temperature for oxidation?Read the answer and worked solution →On an Ellingham plot, a metal whose line lies lower forms which kind of oxide?Read the answer and worked solution →How does the stability of metallic oxides change as temperature rises?Read the answer and worked solution →Which oxides easily undergo thermal decomposition because they are highly unstable?Read the answer and worked solution →What happens when aluminium reacts with iron oxide in thermite?Read the answer and worked solution →How does the free energy of formation of CO2 vary with heat?Read the answer and worked solution →Which oxide of carbon dominates at higher temperatures, above about 700 degrees Celsius?Read the answer and worked solution →What does the crossing of two lines in an Ellingham plot mean?Read the answer and worked solution →Which cheap material is rendered into coke to serve as a reducing agent?Read the answer and worked solution →Roughly what minimum temperature lets graphite reduce zinc oxide?Read the answer and worked solution →Where in a blast furnace is haematite reduced, at roughly 600 to 700 degrees Celsius?Read the answer and worked solution →

Worked practice questions

Which medium does hydrometallurgy rely on to extract metals?

  1. Molten slag at high heat
  2. Aqueous solutions
  3. Dry gaseous oxidation
  4. Strong magnetic fields
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Correct answer: B. Aqueous solutions

Hydrometallurgy dissolves the valuable metal into water-based solutions, which is what separates it from furnace-based routes.

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What is the first step of a hydrometallurgical process?

  1. Smelting in a furnace
  2. Zone refining of metal
  3. Leaching of the ore
  4. Calcining the ore
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Correct answer: C. Leaching of the ore

Leaching dissolves the valuable metal into a solvent, after which the solution is purified and the metal recovered.

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Pyrometallurgy is a branch of extraction that depends mainly on what?

  1. Bacterial action in tanks
  2. Aqueous leaching solutions
  3. Electrolysis in water
  4. High temperature processes
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Correct answer: D. High temperature processes

Pyrometallurgy uses heat to drive reactions among gases, solids and molten materials, as in roasting and smelting.

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