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Principles & Isolation of Elements Test - 5

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Principles & Isolation of Elements Test - 5
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  • Question 1
    1 / -0.25

     

    Ultrapurification method is used for

     

    Solution

     

     

    Fact

     

     

  • Question 2
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    Which metal is used in paints and lacquers?

     

    Solution

     

     

    Al is generally used in paints and lacquers.

     

     

  • Question 3
    1 / -0.25

     

    Extraction process of Bauxite is known as

     

    Solution

     

     

    Hall –Heroult process of extraction of Al from Bauxite.

     

     

  • Question 4
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    Which among the following ores are not found on earth ’s crust?

     

    Solution

     

     

    Nitrides are not found in Earth crust.

     

     

  • Question 5
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    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 6
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    Which among the following act as froth stabilizer?

     

    Solution

     

     

    Aniline stabalises the froath.

     

     

  • Question 7
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    Impurities associated with Bauxite ore is/are

     

    Solution

     

     

     

    Bauxite ore have silica, Fe2 O3 , TiO2  as impurity.

     

     

  • Question 8
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    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 9
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    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 10
    1 / -0.25

     

    Blister copper is about

     

    Solution

     

     

    Blistter Cu is 98% Cu.

     

     

  • Question 11
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    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 12
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    Which of the following ore contains both Mg and Ca?

     

    Solution

     

     

    Dolomite is MgCO3 .CaCO3

     

     

  • Question 13
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    Leaching of gold is done by

     

    Solution

     

     

    Cyanide forms soluble complex with the gold.

     

     

  • Question 14
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    Which among the following reaction takes place in zone of heat absorption?

     

    Solution

     

     

    Reduction of CO2  to CO  involves heat absorption.

     

     

  • Question 15
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    Calamine is an ore of

     

    Solution

     

     

    Calamine is ore of zinc.

     

     

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