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Isolation of Elements Test 1

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Isolation of Elements Test 1
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The common impurity present in most of the ores is

    Solution

    Silica is most common impurity present in ores.

  • Question 2
    1 / -0

    Which metal is also found in sea beds ?

    Solution

    Manganese is found in sea beds.

  • Question 3
    1 / -0

    The sulphide ore of iron is

    Solution

    FeS2 is iron pyrites.

  • Question 4
    1 / -0

    Carbonate ore of iron is

    Solution

    FeCO3 is siderite.

  • Question 5
    1 / -0

    The process of separating gangue and other impurities from the metals is known as

    Solution

    Process of removal of impurities from ore is known as concentration of ore or benefication of ore.

  • Question 6
    1 / -0

    Which technique utilizes the density difference between the ore and the impurity to concentrate the ore is

    Solution

    Levigation is process of grinding an insoluble substance to a fine powder while wet. The material is introduced into mill together with water. It is based on the density difference between ore and impurity.

  • Question 7
    1 / -0

    Gravity separation technique is mainly applicable to

    Solution

    Gavity separation is done maily for oxide ores.

  • Question 8
    1 / -0

    The diagram shows schematic representation of 

    Solution

    This is hydraulic washing or gravity separation. Here whwn stream of water is passed it takes away all the impurity with it.

  • Question 9
    1 / -0

    In extraction of gold and silver, the metals is leached into aqueous solution using

    Solution

    CN- forms complex with gold or silver.

  • Question 10
    1 / -0

    Liquation method is used for the metals which have

    Solution

    Liquification is purification technique used for metals having low melting points.

  • Question 11
    1 / -0

    Ultrapurification method is used for

    Solution

    Fact

  • Question 12
    1 / -0

    Which metal is used in paints and lacquers?

    Solution

    Al is generally used in paints and lacquers.

  • Question 13
    1 / -0

    Extraction process of Bauxite is known as

    Solution

    Hall – Heroult process of extraction of Al from Bauxite.

  • Question 14
    1 / -0

    Which among the following ores are not found on earth’s crust?

    Solution

    Nitrides are not found in Earth crust.

  • Question 15
    1 / -0

    In the froth floatation process for the concentration of ore, the particles float because

    Solution

    In froth floatation ore particles get wetted with oil and comes to the surface with froath.

  • Question 16
    1 / -0

    Which among the following act as froth stabilizer?

    Solution

    Aniline stabalises the froath.

  • Question 17
    1 / -0

    Impurities associated with Bauxite ore is/are

    Solution

     

    Bauxite ore have silica, Fe2O3, TiO2 as impurity.

  • Question 18
    1 / -0

    At 1123 K temperature in the blast furnace, CO reduces

    Solution

    At this Temp range free energy for the process is negative.

    Important Questions for Class 12 Chemistry Chapter 6 General ...

    Hence A is correct.

  • Question 19
    1 / -0

    In the extraction of nickel by Mond’s process, the metal is obtained by

    Solution

    Ni is first reacted with CO to form Nickel tetracarbonyl which is volatile. From this complex Nickel is extracted by thermal decomposition.

  • Question 20
    1 / -0

    Blister copper is about

    Solution

    Blistter Cu is 98% Cu.

  • Question 21
    1 / -0

    Refining of silver is done by

    Solution

    Cupellation is a process where ores are treated under high temperatures and controlled operations to separate noble metals like gold and silver, from base metals like led, copper, zinc, and others present in the ore or alloyed metal.

  • Question 22
    1 / -0

    Which of the following ore contains both Mg and Ca?

    Solution

    Dolomite is MgCO3.CaCO3

  • Question 23
    1 / -0

    Leaching of gold is done by

    Solution

    Cyanide forms soluble complex with the gold.

  • Question 24
    1 / -0

    Which among the following reaction takes place in zone of heat absorption?

    Solution

    Reduction of CO2 to CO involves heat absorption.

  • Question 25
    1 / -0

    Calamine is an ore of

    Solution

    Calamine is ore of zinc.

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