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Metals and Non-metals Test - 24

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Metals and Non-metals Test - 24
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  • Question 1
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    Which of the following elements has the highest melting point?
    Solution
    Among the following option diamond has highest melting point. As in diamond each carbon atom is covalently bonded to four other carbon atoms. So, a lot of energy is needed to separate the atoms. This is because covalent bonds are strong. This is the reason why diamond has a high melting point.
    Hence, the correct option is (C).
  • Question 2
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    Which of the following elements will have electronic configuration as 2, 8, 3?
    Solution
    Aluminium is a chemical element with the symbol Al and atomic number 13. It is a silvery-white, soft, non-magnetic and ductile metal
    Electronic Configuration of Aluminium=2,8,3
    Hence, the correct option is (D ).
  • Question 3
    1 / -0
    To which of the following classes of elements does lithium belong?
    Solution
    Alkali metals are so called because they form hydroxides on reaction with water which are strongly alkaline in nature. Lithium is considered alkali metals as it has only one electron in its outermost shell and it form hydroxide which is alkaline in nature.
    Hence, the correct option is (A).
  • Question 4
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    Which of the following metals breaks down when beaten with hammer?
    Solution
    Soft metals such as potassium are neither ductile nor malleable and they will break easily when beaten with hammer.
    Hence, the correct option is (D).
  • Question 5
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    Iron is shiny grey initially, but after some time, a layer of hydrated iron (III) oxide forms over it in the presence of
    Solution
    Iron is shiny grey initially, but after some time, a layer of hydrated iron (III) oxide forms over it in the presence of water vapours and oxygen.
    The exposure of iron (or an alloy of iron) to oxygen in the presence of moisture leads to the formation of rust. This reaction is not instantaneous, it generally proceeds over a considerably large time frame. The oxygen atoms bond with iron atoms, resulting in the formation of iron oxides. This weakens the bonds between the iron atoms in the object/structure.
    Hence, the correct option is (B).
  • Question 6
    1 / -0
    How many metals are liquid at room temperature?
    Solution
    The only metals at standard temperature and pressure is mercury (Hg). Although, metal becomes liquid at or just above room temperature.
    Hence, the correct option is (A).
  • Question 7
    1 / -0
    Which of the following metals has the lowest melting point?
    Solution
    Among the following options, francium which is an alkali metal has melting point around 8oC.
    Hence, the correct option is (C ).
  • Question 8
    1 / -0
    Which of the following non-metals is a good conductor of electricity?
    Solution
    Graphite, a allotrope of carbon is a good conductor of electricity because it contains delocalized electrons which are carriers of electrical current. In graphite, the carbon atom is connected to three adjacent carbon atoms due to which one electron remains free which is responsible for conducting electricity.
    Hence, the correct option is (A).
  • Question 9
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    Which of the following metals is shiny initially, but after some time, a black coating forms on it?
    Solution
    Silver is a beautiful, lustrous metal, but both pure silver and its common alloys tarnish easily when exposed to the air. Tarnish is the unsightly black coating that forms on silver jewelry when it comes into contact with sulphur in the air. Contact with sulphur causes a chemical reaction that forms silver sulphide(Ag2S), which appears as a black layer on the surface of the jewelry. While this layer can easily be removed, it is best to prevent it from occurring at all by using tarnish-resistant coatings.
    Chemical reaction involved:
    \(4 Ag +2 H _{2} S + O _{2} \longrightarrow 2 Ag _{2} S +2 H _{2} O\)
    Hence, the correct option is (C).
  • Question 10
    1 / -0
    Which of the following non–metals is yellow in colour?
    Solution
    Sulphur is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Elemental sulphur(S8) is a bright yellow, crystalline solid at room temperature.
    Hence, the correct option is (B).
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