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NDA II 2019 Organic Chemistry Test - 1
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NDA II 2019 Organic Chemistry Test - 1

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  • Question 1/10
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    Which of the following is incorrect?

    Solutions

    Diamond is an allotrope of carbon which was first confirmed by the English chemist Smithson Tennant, who was the first to burn a diamond in air producing carbon dioxide. Thus, according to this statement, option (3) is incorrect.

     

  • Question 2/10
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    Lamp black, an amorphous form of carbon is prepared by

    Solutions

    Lamp black, an amorphous form of carbon, is prepared by heating kerosene oil in a limited supply of air.

     

  • Question 3/10
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    Directions For Questions

    Consider the following statements regarding graphite.

    I. It is an allotrope of carbon.

    II. It is a good conductor of heat and electricity.

    III. It can be artificially produced.

    ...view full instructions

    Of these statements, which of the following are correct?

    Solutions

    All the given statements are correct because graphite is an allotrope of carbon, which is a good conductor of heat and electricity and can also be produced artificially.

     

  • Question 4/10
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    Which of the following substances is used as a lubricant?

    Solutions

    Graphite is an allotropic form of carbon which can be used as a lubricant.

     

  • Question 5/10
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    Which of the following is an essential element in all organic compounds?

    Solutions

    Carbon is an essential element in all organic compounds.

     

  • Question 6/10
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    Which of the following substances is the hardest?

    Solutions

    Diamond is the hardest known substance.

     

  • Question 7/10
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    Graphite is a good conductor of electricity due to the presence of

    Solutions

    Graphite is a good conductor of electricity due to the presence of mobile (free) electrons.

     

  • Question 8/10
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    The allotropic form of carbon known as charcoal

    Solutions

    There are two allotropic forms of carbon.
    (1) Crystalline form: There are three crystalline forms of carbon: diamond, graphite and bucky ball.
    (2) Amorphous form: There are various amorphous forms of carbon: coal, coke, charcoal, lampblack, gas carbon, etc.

     

  • Question 9/10
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    Graphite is used as a lubricant because

    Solutions

    Graphite is used as a lubricant because it consists of layers which readily slip over one another.

     

  • Question 10/10
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    Heterocyclic compounds have a ring comprising of \'O\', \'S\' or \'N\' atoms along with carbon atoms.

    Pyridine is a heterocyclic compound comprising of a 6 membered ring of

    Solutions

    Pyridine is a heterocyclic compound as it is a cycle that does not only contain carbon atoms, but also nitrogen. The structure of pyridine is as follows.

     

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