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Metals and Non-metals Test - 17

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Metals and Non-metals Test - 17
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  • Question 1
    1 / -0
    What is the colour of the coating formed on copper when it reacts with moist carbon dioxide?
    Solution
    When a copper vessel 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 (C).
  • Question 2
    1 / -0
    Which of the following gases is produced during roasting?
    Solution
    Roasting: In roasting, the ore is heated in a regular supply of air in a furnace at a temperature below the melting point of the metal. Some of the reactions involving sulphide ores are:
    2ZnS+3O22ZnO+2SO2
    2PbS+3O22PbO+2SO2
    2Cu2S+3O22Cu2O+2SO2
    Hence, the correct option is (D)
  • Question 3
    1 / -0
    Which of the following gases is produced during calcination?
    Solution
    CO2 is produced during calcination. It involves heating when the volatile matter escapes leaving behind the metal oxide.
    ZnCO3(s)ΔZnO(s)+CO2(g)
    CaCO3MgCO3(s)ΔCaO(s)+MgO(s)+2CO2(g)
    Hence, the correct option is (A).
  • Question 4
    1 / -0
    Which of the following is a major source of metals?
    Solution
    For obtaining a metal, first we look for minerals which are naturally occurring chemical substances in the earth’s crust obtainable by mining.
    So, the major source of metals is the earth crusts.
    Hence, the correct option is (B).
  • Question 5
    1 / -0
    Some minerals contain high percentage of a particular metal. These minerals are known as 
    Solution
    Minerals are naturally occurring chemical substances in the earth’s crust obtainable by mining.
    Out of many minerals in which a metal may be found, only a few are viable to be used as sources of that metal. Such minerals are known as ores.
    Hence, the correct option is (A).
  • Question 6
    1 / -0
    Which of the following elements is used as a reducing agent for obtaining zinc from zinc oxide?
    Solution
    The reduction of zinc oxide is done using coke. The temperature, in this case, is higher. For the purpose of heating, the oxide is made into brickettes with coke and clay.
    ZnO+Ccoke,673KZn+CO
    The metal is distilled off and collected by rapid chilling.
    Hence, the correct option is (A).
  • Question 7
    1 / -0
    Silver articles become __________ after some time, when exposed to air.
    Solution
    When silver articles are exposed to air it becomes black after some time because the silver metal reacts with hydrogen sulphide present in the atmosphere that leads to the formation of silver sulphide (Ag2S) because of which they appear dull and black. This is a kind of corrosion of silver metal.
    Ag+H2SAg2S+H2
    Hence, the correct option is (A).
  • Question 8
    1 / -0
    The elements or compounds which occur naturally in the earth's crust are known as 
    Solution
    Minerals are naturally occurring chemical substances in the earth’s crust obtainable by mining.
    Hence, the correct option is (C).
  • Question 9
    1 / -0
    Which of the following is a dehydrating agent?
    Solution
    Anhydrous calcium chloride is known as “hygroscopic”. This means that it draws in water molecules and moisture from its environment and thus acts as a dehydrating agent. The anhydrous calcium chloride will absorb any water (including condensation, vapour etc) in its environment. It effectively traps that water by changing its molecular make-up.
    Hence, the correct option is (A).
  • Question 10
    1 / -0
    Which of the following contains some soluble salts such as sodium chloride, magnesium chloride, etc?
    Solution
    Seawater is a complex mixture of 96.5 percent water, 2.5 percent salts(sodium chloride, magnesium chloride), and smaller amounts of other substances, including dissolved inorganic and organic materials, particulates, and a few atmospheric gases.
    Hence, the correct option is (C).
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