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Arunachal Pradesh Board Class 12 Isolation of Elements — practice questions

Explore 30 free Isolation of Elements questions in Arunachal Pradesh Board Class 12 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Isolation of Elements questions and exercises with answers

Showing questions 1–30 of 30.

A mineral from which a metal can be extracted profitably is called an:Read the answer and worked solution →The unwanted earthy material mixed with an ore is called:Read the answer and worked solution →The principal ore from which aluminium is extracted is:Read the answer and worked solution →Washing powdered ore in running water so that light gangue floats away is:Read the answer and worked solution →Separation using a magnet works when either the ore or the gangue is:Read the answer and worked solution →The method used mainly to remove gangue from sulphide ores is:Read the answer and worked solution →Dissolving an ore in a suitable solvent to separate it from insoluble gangue is:Read the answer and worked solution →Heating an ore strongly in the absence of air to drive off volatile matter is:Read the answer and worked solution →Heating a sulphide ore in a regular supply of air to convert it to oxide is:Read the answer and worked solution →The diagram that helps choose a reducing agent by plotting free energy against temperature is the:Read the answer and worked solution →Iron ore, coke and limestone are fed from the top into a:Read the answer and worked solution →Limestone added to a furnace to remove silicate impurity acts as a:Read the answer and worked solution →The molten waste that separates above the metal in a furnace is called:Read the answer and worked solution →Iron drawn from a blast furnace contains about 4 per cent carbon and is called:Read the answer and worked solution →In electrolytic refining, the impure metal is used as the:Read the answer and worked solution →In electrolytic refining, the pure metal is deposited on the:Read the answer and worked solution →The impurities left below the anode during electrolytic refining form the:Read the answer and worked solution →Refining based on impurities being more soluble in the melt than in the solid is:Read the answer and worked solution →Zone refining is especially useful for producing very pure:Read the answer and worked solution →Turning a metal into a volatile compound and then decomposing it back is:Read the answer and worked solution →The electrolytic process used to extract aluminium from alumina is the:Read the answer and worked solution →The number of refining methods listed for metals, from distillation to chromatography, is:Read the answer and worked solution →Catch the concentration methodsRead the answer and worked solution →Pop the furnace wordsRead the answer and worked solution →Run the metallurgy gatesRead the answer and worked solution →Slice the metallurgy termsRead the answer and worked solution →Concentrate or refineRead the answer and worked solution →Sort the extraction stepsRead the answer and worked solution →Type the numberRead the answer and worked solution →Metallurgy bingoRead the answer and worked solution →

Worked practice questions

A mineral from which a metal can be extracted profitably is called an:

  1. Ore body
  2. Oil shale
  3. Ash heap
  4. Acid rock
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Correct answer: A. Ore body

1. Not every mineral is worth mining for its metal. 2. Those that are worth it have a special name. 3. They are ore bodies. _Source: syllabus Chemistry Part I, Class XII, General Principles and Processes of Isolation of Elements._

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The unwanted earthy material mixed with an ore is called:

  1. Grate
  2. Gangue
  3. Gauge
  4. Grain
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Correct answer: B. Gangue

1. An ore as mined is never pure. 2. The waste rock around the mineral has a name. 3. That waste is gangue. _Source: syllabus Chemistry Part I, Class XII, General Principles and Processes of Isolation of Elements._

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The principal ore from which aluminium is extracted is:

  1. Bauxite
  2. Barytes
  3. Bornite
  4. Blister
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Correct answer: A. Bauxite

1. One ore is chosen for extracting aluminium. 2. It contains alumina with silica and iron oxides. 3. That ore is bauxite. _Source: syllabus Chemistry Part I, Class XII, General Principles and Processes of Isolation of Elements._

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