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Metals and Non-metals Test - 18

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Metals and Non-metals Test - 18
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following ores cannot be reduced simply by heating in the air?

    Solution
    \(ZnCO_3\) cannot be reduced simply by heating in the air. It is a carbonate that can be converted into its oxide by heating it in absence of air. This process is known as calcination.
    \(ZnCO _{3}( s ) \stackrel{\Delta}{\longrightarrow} ZnO ( s )+ CO _{2}( g )\)
    Hence, the correct option is (A).
  • Question 2
    1 / -0

    From which of the following minerals can the metal be extracted profitably?

    Solution
    Naturally occurring substances from which a metal can be profitably (or economically) extracted are called Ores.
    Hence, the correct option is (D).
  • Question 3
    1 / -0

    In the process of electrolytic refining, which of the following processes occur on passing electric current through the electrolyte?

    Solution
    In electrolytic refining, the impure metal is made to act as an anode. A strip of the same metal in pure form is used as a cathode. They are put in a suitable electrolytic bath containing soluble salt of the same metal. The more basic metal remains in the solution and the less basic ones go to the anode mud.
    Hence, the correct option is (D).
  • Question 4
    1 / -0

    During electrolytic refining of nickel, _______ is taken as anode.

    Solution
    Electrolytic refining is the process of refining of metal in which impure metal is made the anode and a thin strip of pure metal is made the cathode. A solution of the metal salt is used as an electrolyte.
    In the case of nickel, crude nickel is taken as Anode.
    Hence, the correct option is (C).
  • Question 5
    1 / -0

    The reaction between ___________ is called thermite reaction.

    Solution
    The reaction between iron oxide and aluminium is called a thermite reaction. A thermite reaction is an exothermic oxidation-reduction reaction
    In this process elemental aluminium reduces the oxide of another metal. For example iron oxide, because aluminium forms stronger and more stable bonds with oxygen than iron:
    \(Fe _{2} O _{3}+2 Al \rightarrow 2 Fe + Al _{2} O _{3}\)
    Hence, the correct option is (B).
  • Question 6
    1 / -0

    Calcination is done for the reduction of which of the following compounds?

    Solution
    Calcination is done for the reduction of carbonate. It involves heating when the volatile matter escapes leaving behind the metal oxide.
    Ex -
    \(ZnCO _{3}( s ) \stackrel{\Delta}{\longrightarrow} ZnO ( s )+ CO _{2}( g )\)
    Hence, the correct option is (D).
  • Question 7
    1 / -0

    Copper reacts with moist carbon dioxide in the air to form _________.

    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 \(( CuCO_ 3)\).
    Hence, the correct option is (B).
  • Question 8
    1 / -0

    Which of the following is necessary for rusting to take place?

    Solution
    The rusting of iron (iron in contact with water forms the anode and in contact with air forms the cathode). At the anode, iron is oxidized to \(Fe ^{2+}\), and at the cathode, oxygen is reduced to water. Iron and steel rust when they come into contact with water and oxygen. Both water and oxygen are needed for rusting to occur.
    Hence, the correct option is (B).
  • Question 9
    1 / -0

    During the electrolytic refining of metals, insoluble impurities are known as 

    Solution
    During the electrolytic refining of metals, insoluble impurities are known as anode mud
    In electrolytic refining, the impure metal is made to act as an anode. A strip of the same metal in pure form is used as a cathode. They are put in a suitable electrolytic bath containing soluble salt of the same metal.The more basic metal remains in the solution and the less basic ones go to the anode mud.
    Hence, the correct option is (B).
  • Question 10
    1 / -0

    Which of the following metals can be extracted from its sulphide ore simply by heating?

    Solution
    Copper can be extracted from its sulphide ore simply by heating in regular supply of air.
    Chemical reaction involved:
    \(2 Cu _{2} S +3 O _{2} \rightarrow 2 Cu _{2} O +2 SO _{2}\)
    Hence, the correct option is (C).
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