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Carbon And Its Allotropes Test - 5

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Carbon And Its Allotropes Test - 5
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Weekly Quiz Competition
  • Question 1
    1 / -0
    What is the process of heating wood/coal in absence of air known as?
    Solution

    Destructive distillation is the process in which a solid material (usually coal or wood) is heated at a high temperature out of contact with air to make coke, coal tar, or charcoal. It is called `destructive` because the chemical composition of the end product is distinctly different from that of the input material.

  • Question 2
    1 / -0
    What is C - C bond length in graphite?
    Solution

    The C-C bond length in graphite is 142 pm or 1.42Ao.

  • Question 3
    1 / -0
    Due to which of the following reasons is graphite a good conductor of electricity?
    Solution
    In graphite, each carbon atom is covalently bonded to three other carbon atoms to make layers of hexagonal rings that can slip past one another. Therefore, in graphite each carbon atom has a free electron in its outermost energy shell. This free electron is responsible for conductivity of electricity through graphite.
  • Question 4
    1 / -0
    Which of the following statements is correct about the thermal conductivity of diamond?
    Solution

    Diamond is a good conductor of heat because of the strong covalent bonding and low phonon scattering. This is the reason why diamond has high conductivity.

  • Question 5
    1 / -0
    What is the order of abundance of carbon in the earth`s crust?
  • Question 6
    1 / -0
    The isotope of carbon which is used in radio carbon dating is
    Solution

    Carbon-14, 14C, or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

  • Question 7
    1 / -0
    The isotope of carbon which is fixed as an internal standard for measurement of atomic mass is
  • Question 8
    1 / -0
    Which of the following options is an example of crystalline form of carbon?
    Solution

    Graphite is a naturally-occurring form of crystalline carbon. It is a native element mineral found in metamorphic and igneous rocks. Graphite is a mineral of extremes.

  • Question 9
    1 / -0
    Which of the following is denser than graphite?
  • Question 10
    1 / -0
    In the structure of diamond, each carbon is bonded to ________ other carbon atoms by a/an________.
  • Question 11
    1 / -0
    In the structure of graphite, two layers are held together by _______ .
  • Question 12
    1 / -0
    Which of the following allotropic form of carbon is used for making electrodes?
    Solution

    Graphite is an electrical conductor, due to which it is used in electrical arc lamp electrodes.
    The correct option is 2.

  • Question 13
    1 / -0
    Which of the following amorphous forms of carbon is used as an adsorbent for gases and for making gas masks?
  • Question 14
    1 / -0
    Which of the following options was originally made by evaporation of graphite using laser?
  • Question 15
    1 / -0
    How many membered carbon rings are present in a molecule of C60?
    Solution
    5 and 6 membered carbon rings are present in a molecule of C60
  • Question 16
    1 / -0
    What is number of carbon rings present in C60 fullerene?
  • Question 17
    1 / -0
    Which of the following allotropic forms of carbon is used as pigment in ink, paints and plastics?
    Solution
    Carbon black is a material produced by the incomplete combustion of heavy petroleum products. It is used as a colour pigment in plastics, paints, and inks.
  • Question 18
    1 / -0
    Which of the following gaseous compounds is known as the laughing gas?
    Solution

    Nitrous oxide, commonly known as laughing gas, is a chemical compound, an oxide of nitrogen with the formula N2O.

  • Question 19
    1 / -0
    Which of the following carbon compounds is known as the hardest substance?
  • Question 20
    1 / -0
    Which of the following allotropic forms of carbon is used for making pencil lead?
    Solution

    Pencil lead is made up of a non-toxic mineral called graphite.

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