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Chemistry Exam  >  Chemistry Tests  >  Test: General Methods of Isolation and Purification - 2 - Chemistry MCQ

Test: General Methods of Isolation and Purification - 2 - Chemistry MCQ


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18 Questions MCQ Test - Test: General Methods of Isolation and Purification - 2

Test: General Methods of Isolation and Purification - 2 for Chemistry 2024 is part of Chemistry preparation. The Test: General Methods of Isolation and Purification - 2 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: General Methods of Isolation and Purification - 2 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: General Methods of Isolation and Purification - 2 below.
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Test: General Methods of Isolation and Purification - 2 - Question 1
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In the commercial electrochemical process for aluminium extraction, the electrolyte used as:

Test: General Methods of Isolation and Purification - 2 - Question 2
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Electrolytic reduction of alumina to aluminium by Hall Heroult process is carried out:

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Test: General Methods of Isolation and Purification - 2 - Question 3
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Which of the following processes is used in extractive metallurgy of magnesium?

Test: General Methods of Isolation and Purification - 2 - Question 4
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Which ore contains both iron and copper ?
Test: General Methods of Isolation and Purification - 2 - Question 5
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Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of
*Multiple options can be correct
Test: General Methods of Isolation and Purification - 2 - Question 6
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Extraction of metal from the ore cassiterite involves is a
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Tin is obtained by reducing the ore cassiterite with coal in a reverberatory furnace; Limestone is added to produce a slag with the impurities, which can be separated.

SnO2 + 2C⟶ Sn + 2CO

Crude tin so obtained is contaminated with iron, copper, lead and other metals. It is, therefore, remelted on an inclined furnace. The process is called liquation.

The initial step involves melting the easily fusible tin, causing it to separate from the less fusible impurities. The molten tin is then stirred with green wooden poles while exposed to air. During this poling process, any remaining metal impurities undergo oxidation, resulting in the formation of a scum that rises to the surface and can be subsequently removed for purification purposes. This technique is known as poling.

Test: General Methods of Isolation and Purification - 2 - Question 7
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Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH3)), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalopyrite involved partial roasting, removal of iron and self-reduction.

Q. Partial roasting of chalcopyrite produces
Test: General Methods of Isolation and Purification - 2 - Question 8
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Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO4.5H2O), atacamite (Cu2CI(OH3)), cuprite (Cu2O), copper glance (Cu2S) and malachite (Cu2(OH)2CO3). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalopyrite involved partial roasting, removal of iron and self-reduction.

Q. In self-reduction, the reducing species is
Test: General Methods of Isolation and Purification - 2 - Question 9
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Froth floatation method is mostly used for the concentration of  _____________
Detailed Solution for Test: General Methods of Isolation and Purification - 2 - Question 9

Concept:

Process of Concentration

  • The metal ores extracted contain impurities known as gauge particles. 
  • The gauge particle is separated from the ore by the process known as concentration. 
  • Froth flotation, magnetic separation, Leaching are some of the commonly used processes of concentration. 

Froth floatation method

  • It is a process that selectively separates materials based upon whether they are water-repelling (hydrophobic) or have an affinity for water (hydrophilic).
  • If the minerals are of Hydrophobic nature then only can get attracted toward froth and not with water.
  • The process is commonly used for sulphide ores.
  • This is because pine oil  used in the process selectively wets the sulphide ore and hence brings it to the froth.
  • Froth flotation can primarily be done under two common techniques:
    • Direct floatation technique- The mineral sticks to the air bubble and the remaining gangue settles down at the bottom.
    • Reverse floatation technique- The gangue sticks to the air bubble and ore particle settle down in the bottom.

So, the correct option is Sulphide Ores. 

Additional Information:

Magnetic Separation

  • Magnetic ores are mainly separated by magnetic separation method. 
  • It has a conveyer belt with an electromagnetic. The powdered ore is made to pass through belt and electromagnet.
Test: General Methods of Isolation and Purification - 2 - Question 10
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Q. Which of the above metal oxide is having minimum thermal decomposition temperature.
Test: General Methods of Isolation and Purification - 2 - Question 11
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Q. Which of above curve is wrongly presented.
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Q. Which of the following metal’s oxide can reduced by Fe as reducing agent at temperature T,
Test: General Methods of Isolation and Purification - 2 - Question 13
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The chemical process in the production of steel from haematite ore involve:
Test: General Methods of Isolation and Purification - 2 - Question 14
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The chemical composition of “slag” formed during the smelting process in the extraction of copper is:
Test: General Methods of Isolation and Purification - 2 - Question 15
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The methods chiefly used for the extraction of lead and tin from their ores are respectively:
Test: General Methods of Isolation and Purification - 2 - Question 16
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Extraction for zinc from zinc blende is achieved by:
Test: General Methods of Isolation and Purification - 2 - Question 17
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Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
Test: General Methods of Isolation and Purification - 2 - Question 18
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How many number of water molecule (s) directly bonded to the metal centre in CuSO4.5H2O is
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