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Materials Metals and Non Metals Test - 23

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Materials Metals and Non Metals Test - 23
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Weekly Quiz Competition
  • Question 1
    1 / -0
    When a little sulphur in a spoon is heated, it burns with a blue flame which slowly disappears after some time and we can feel a pungent odour. This pungent odour is due to:
    Solution
    Sulphur burns with a blue flame concomitant with formation of sulphur dioxide notable for its peculiar suffocating odour.

    Hence, the pungent odour is due to formation of $$SO_2$$.
  • Question 2
    1 / -0
    Which element is an important component of transistors?
    Solution
    Germanium metal is used as a semiconductor in transistors and various other electronic devices. These days its production for use in semiconductor electronics is a very small fraction, only $$2\ \%$$.

    Hence, option $$C$$ is correct. 
  • Question 3
    1 / -0
    A metal which is brittle in nature is:
    Solution
    Zinc is relatively more brittle than iron, gold and aluminium.

    The correct option is A.
  • Question 4
    1 / -0
    The red or orange coating that forms on the surface of iron when exposed to air and moisture for some time is called:
    Solution
    Corrosion is the formation of metal oxide when exposed to moist air. Rust is iron oxide. Corrosion occurs in the presence of moisture. For example, when iron is exposed to moist air, it reacts with oxygen to form $$rust(Fe_2O_3 . xH_2O)$$.

    Hence, option $$C$$ is correct.
  • Question 5
    1 / -0
    Graphite is a ______ conductor of electricity whereas diamond is a ______ conductor of electricity.
    Solution
    Carbon has a valency of 4. In graphite, one valence electron of each carbon atom remains free. These electrons are free to move between the layers of graphite, making graphite a conductor of electricity.  

    In diamond, each carbon atom is attached to four other carbon atoms forming a tetrahedral structure and has no free or loosely bound electrons. Thus, diamonds cannot conduct electricity.

    Hence, option B is correct.
  • Question 6
    1 / -0
    Which of the following possess lustre?
    Solution
    $$A,\ B$$ and $$C$$ are all metals with free electrons. Light does not penetrate very far into the surface of a metal and is typically reflected or bounced off the metallic surface by the mobile electrons and what you get is a metallic reflection, which is known as lustre.
  • Question 7
    1 / -0
    Which among the following is a poor conductor of electricity?
    Solution
    Among all the options, only oxygen is non-metal. Non-metals do not have enough free electrons for the flow of electricity. And hence are bad conductors of electricity.
  • Question 8
    1 / -0
    Ductile metals can be deformed into:
    Solution
    Ductility is when a solid material stretches under tensile stress. If ductile, a material can be stretched into a wire.
  • Question 9
    1 / -0
    The oxides of _____ which react with water to form acids are called acidic oxides.
    Solution
    All nonmetals form covalent oxides with oxygen, which react with water to form acids are called acidic oxides.

    Example: $$SO_2 + H_2O \rightarrow H_2SO_3$$
  • Question 10
    1 / -0
    Which among the following is a non-ductile metal at room temperature?
    Solution
    Mercury is a non-ductile metal because it is liquid at room temperature and hence cannot be drawn into wires.
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