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General Principles and Processes of Isolation of Elements Test - 20

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General Principles and Processes of Isolation of Elements Test - 20
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  • Question 1
    1 / -0

    The common metal present in german silver, bell metal and brass is :

    Solution
    German Silver is an alloy of Copper with Nickel.
    Brass is an alloy of Copper and Zinc.
    Bell metal is an alloy of Copper, Tin and Iron.

    Copper (Cu) is the common metal present in the given alloys.
  • Question 2
    1 / -0
     During extraction of metals, electrolytic refining is used to obtain pure metals. What is the electrolyte used?
    Solution
     During extraction of metals, electrolytic refining is used to obtain pure metals. The electrolyte used can be either Silver salt (for refining silver metal) or Copper(ll) sulphate (for refining copper metal). It cannot be Sodium chloride fused as sodium chloride (along with calcium chloride and KF) is used in the extraction of Sodium metal.
  • Question 3
    1 / -0
    Which is not a mineral of aluminium?
    Solution
    Anhydrite: anhydrous $$CaSO_4$$

    Bauxite:  $$AlO_x (OH)_{(3-2x)}$$

    Diaspore:  $$Al_2 O_3 .H_2 O $$

    Corundum:  $$Al_2 O_3$$

    Option A is correct.
  • Question 4
    1 / -0
    ASSERTION: $$CuFeS_{2}$$ is concentrated by froth floatation method.
    REASON: $$CuFeS_{2}$$ is the main ore of copper.
    Solution
    Chief ore of copper is copper pyrite ($$CuFeS_{2}$$). It is a sulphide ore and sulphide ores are concentrated by froth flotation method.
  • Question 5
    1 / -0
    Which of the following pair is incorrectly matched?
    Solution
    Hint: Froth flotation is used for sulfide ores.

    Correct Answer: Option C

    Explanation:
    A) Van Arkel method is used for Zirconium and Titanium.
    B) The Krolls process is a pyrometallurgical industrial process used to produce metallic Titanium.
    C) Cerussite is a carbonate ore of Lead. Therefore, froth floatation can't be used.
    D) Distillation is used for low boiling metals like Zinc.
  • Question 6
    1 / -0
    In bessemer converter, oxides of manganese and silicon are removed as: 
    Solution
    It is the industrial process for the mass production of steel from pig iron. The oxidation process removes impurities such as silicon, manganese and carbon in the form of oxides. These oxides are escaped in the form of solid slag.
  • Question 7
    1 / -0
    Which of the following gases is responsible for the flame at the mouth of Bessemer converter?
    Solution
    Carbon monoxide gas from coke is responsible for flame at the mouth of Bessemer converter, as it burns to form carbon dioxide.
  • Question 8
    1 / -0
    When copper rod is dipped in $$CuSO_4$$ solution, the potential developed at the interface is called as __________ .
    Solution
    Copper rod is dipped into $$CuSO_4$$ solution. Since, copper is a less active metal, $$Cu^{+2}$$ ions present in the solution accept an electron from the metal rod and copper is deposited on the metal rod. Hence, copper rod becomes positively charged, and attracts the negatively charged $$SO_4^{-2}$$ ions from the solution. Thus, an electrical double layer is created and a potential at the interface of copper rod and $$CuSO_4$$ solution. The electrical potential developed at the interface of the metal and its solution due to Helmholtz electrical double layer is called single electrode potential. Thus, when copper rod is dipped in $$CuSO_4$$ solution, the potential developed at the interface is called electrode potential.
  • Question 9
    1 / -0
    Aluminium is used in thermite welding because:
    Solution
    The affinity for oxygen in the case of aluminium is higher than that of iron and therefore, it acts as a strong reducing agent with iron, 
    $$Fe_2O_3 + 2Al \rightarrow 2Fe+Al_2O_3$$
    $$Cr_2O_3+2Al \rightarrow 2Cr +Al_2O_3$$
    This is an important application in the melting of metals. The reaction, being exothermic, produces large amount of heat, thus melting the metal and the process is called thermite welding.
  • Question 10
    1 / -0
    What is anode mud?
    Solution
    Anode mud: Impurities collected at the anode in electrolysis during purification of metals.
    During the electrorefining process, pure zinc gets deposited at the cathode and an equivalent amount of metal dissolves from the anode into the electrolyte in the form of metal ions. Also, impurities settle down below the anode in the form of anode mud.
    Example: Electrorefining of Cu
    At cathode:
    $$Cu^{2+} + 2e^ -\rightarrow Cu$$
    At anode:
    $$Cu   \rightarrow Cu^{2+} + 2e^-$$
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