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Metals and Non-metals Test - 23

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Metals and Non-metals Test - 23
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  • Question 1
    1 / -0
    Which of the following metals cannot be drawn into thin sheets?
    Solution
    Among the following option, sodium is not a malleable metal, as it is very soft and it cannot be converted into sheets.
    Hence, the correct option is (A).
  • Question 2
    1 / -0
    Which of the following non-metals exists as a solid at normal temperature and pressure?
    Solution
    Iodine is a nonmetallic, nearly black solid at room temperature and has a glittering crystalline appearance.
    Hence, the correct option is (D).
  • Question 3
    1 / -0
    Which of the following non-metals is lustrous?
    Solution
    Iodine is a nonmetallic, nearly black solid at room temperature and has a glittering crystalline appearance.
    Hence, the correct option is (D).
  • Question 4
    1 / -0
    Non-metals are poor conductors of electricity because of the absence of
    Solution
    Non-metals are insulators or poor conductors of electricity and heat because they do not have free electrons so they cannot lose electrons to transmit the energy.
    Hence, the correct option is (B).
  • Question 5
    1 / -0
    Which of the following elements is least reactive to the oxygen present in the air at room temperature?
    Solution
    Gold is least reactive to the oxygen present in the air at room temperature
    These metals(Gold and platinum) are placed at the bottom of the activity series and are least reactive in nature. Gold and platinum are known as noble metals. They are not affected by air, water or even by chemicals.
    Hence, the correct option is (D).
  • Question 6
    1 / -0
    Which of the following elements is the hardest?
    Solution
    Diamond, which is a well-known allotrope of carbon is the hardest element. This makes it an excellent abrasive and makes it hold polish and luster extremely well. It is useful for both industrial applications and jewelry.
    Hence, the correct option is (C).
  • Question 7
    1 / -0
    Which of the following elements will gain electron(s) to form an anion?
    Solution
    Among the following options, sulphur will form anion, it requires two-electron to achieve a stable electronic configuration. So, it will except two electrons and form S2- anion.
    Electronic configuration of sulphur: [Ne]3s2 3p4
    Electronic configuration of S2-: [Ne]3s2 3p6
    Hence, the correct option is (A).
  • Question 8
    1 / -0
    Which of the following metals is the poorest conductor of heat?
    Solution
    Among the given options, mercury is the metal which is a poor conductor of heat. It is the only metal that is liquid at standard conditions for temperature and pressure.
    Hence, the correct option is (B).
  • Question 9
    1 / -0
    Which of the following statements is not true about alkali metals?
    Solution
    Alkali metals are silvery-white, soft, and light metals. Because of their large size, they have low density The melting and boiling points of the alkali metals are low indicating weak metallic bonding due to the presence of only a single valence electron in them.
    Hence, the correct option is (B).
  • Question 10
    1 / -0
    Which of the following metals has a shiny appearance initially but with time a green-coloured layer is formed on its surface?
    Solution
    When a copper is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide.
    Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.
    The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3).
    Hence, the correct option is (B).
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