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Bihar Board Class 12 (Science) Extractive Metallurgy — practice questions — page 2

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 31–43 of 43.

At 600 to 700 degrees Celsius, which is the stronger reducing agent for iron oxide?Read the answer and worked solution →The aluminothermic process, also called the thermite reaction, is used to extract which pair?Read the answer and worked solution →Aluminium's Ellingham curve lies below iron's. What does this show?Read the answer and worked solution →What is the main use of Ellingham diagrams in extractive metallurgy?Read the answer and worked solution →What does froth flotation selectively separate?Read the answer and worked solution →Froth flotation separates minerals from gangue by exploiting differences in what?Read the answer and worked solution →Which class of salts is particularly popular as collectors for sulfide minerals?Read the answer and worked solution →Which substance is added as a frother to stabilise foam in flotation?Read the answer and worked solution →Which of these is a typical depressant in froth flotation?Read the answer and worked solution →What is the first flotation stage, which gives a rougher concentrate, called?Read the answer and worked solution →What are the minerals that do not float into the froth called?Read the answer and worked solution →Which collectors have been used for oxide minerals in flotation?Read the answer and worked solution →Flotation is used to purify which compound from sodium chloride and clay?Read the answer and worked solution →

Worked practice questions

At 600 to 700 degrees Celsius, which is the stronger reducing agent for iron oxide?

  1. Carbon, forming CO from C
  2. Carbon monoxide gas
  3. Both are equally strong
  4. Neither can reduce it
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Correct answer: B. Carbon monoxide gas

In that range the 2CO + O2 giving 2CO2 reaction has a more negative free energy change than that for carbon.

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The aluminothermic process, also called the thermite reaction, is used to extract which pair?

  1. Sodium and potassium
  2. Chromium and manganese
  3. Gold and silver
  4. Copper and lead
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Correct answer: B. Chromium and manganese

Aluminium reduces the oxides of chromium and manganese, which carbon cannot do cleanly.

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Aluminium's Ellingham curve lies below iron's. What does this show?

  1. Aluminium can reduce iron oxide
  2. Aluminium is less reactive
  3. Iron can reduce alumina
  4. Chromium oxide is more stable
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Correct answer: A. Aluminium can reduce iron oxide

A lower line means a more stable oxide, so aluminium takes oxygen from the oxides of metals above it.

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