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Metals and Non-metals Test - 22

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Metals and Non-metals Test - 22
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  • Question 1
    1 / -0
    Germanium and silicon are examples of
    Solution
    Germanium and silicon are examples of Metalloids. These elements exist in the realm between metals and non-metals and can have properties of both.
    Hence, the correct option is (D).
  • Question 2
    1 / -0
    Metals are also known as
    Solution
    Metals are also known as electropositive elements as they can easily lose electron and form cations.
    Hence, the correct option is (C).
  • Question 3
    1 / -0
    Which one of the following metals shows a high resistance to the flow of electric current?
    Solution
    Lead will show a high resistance to the flow of electric current, due to absence of free electrons. Aluminium, gold and silver are good conductors of electricity due to the presence of free electrons.
    Hence, the correct option is (D).
  • Question 4
    1 / -0
    Which of the following metals is the best conductor of heat?
    Solution
    Among the given options, silver is the best conductor of heat. Due to this reason, silver is used in many heat transfer applications.
    Hence, the correct option is (B).
  • Question 5
    1 / -0
    How many non-metals exist as gases?
    Solution
    In the modern periodic table, there are 11 non-metals which exist in a gaseous state.
    Hence, the correct option is (A).
  • Question 6
    1 / -0
    Which of the following elements will lose electron(s) to form a positive ion?
    Solution
    As metals are electropositive, they lose an electron and form positive ions. Magnesium is one of the metal which can lose an electron and can form a cation.
    Hence, the correct option is (C).
  • Question 7
    1 / -0
    Most of the non-metals exhibit
    Solution
    Non-metals have a dull appearance and have low poor conductivity of heat and electricity. They have a low density.
    Hence, the correct option is (D).
  • Question 8
    1 / -0
    Which of the following metals is very hard?
    Solution
    From the following metals, osmium is very hard. It is a gray-white metal. It is brittle, and difficult to work, even at high temperatures. Of the platinum metals, it has the highest melting point, so fusing and casting are difficult. Osmium wires were used for filaments of early incandescent lamps before the introduction of tungsten.
    Hence, the correct option is (A).
  • Question 9
    1 / -0
    _________ melt when kept on the palm.
    Solution
    Gallium and Caesium have so low melting point that the heat of the palm is sufficient to melt them.
    Hence, the correct option is (C).
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