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Electrochemistry Test - 53

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Electrochemistry Test - 53
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The amount of chlorine produced per-second through electrolysis in a plate which consumes $$100$$ kW power at $$200$$V is: (Given: Electrochemical equivalent of chlorine $$=0.367\times 10^{-3}$$ g/C)
    Solution

  • Question 2
    1 / -0
    In a galvanic cell:
    Solution
    Galvanic cell uses the energy released during a spontaneous redox reaction (ΔG<0) to generate electricity. This type of electrochemical cell is often called a voltaic cell. 

    In both galvanic and electrolytic cells, oxidation takes place at the anode and electrons flow from the anode to the cathode and reduction takes place at cathode.

    The electrons that are released at the anode flow through the wire, producing an electric current. Galvanic cells, therefore, transform chemical energy into electrical energy that can then be used to do work. 

    Hence, option A is correct.
  • Question 3
    1 / -0
    Which solution will show highest resistance during the passage of current
    Solution
    With increasing concentration of the electrolyte, reducing its conductivity and its resistance increases. Therefore, the $$2N$$ $$NaCl$$ solution will have the greatest resistance.
    therefore Answer is option (B)
  • Question 4
    1 / -0
    Which of the following statements is wrong about galvanic cells?
    Solution
    In galvanic cell, anode is -ve electrode, cathode is +ve electrode because from anode $${e}^{-}$$ is leaving and there must be -vely charge, so that it can charge $${e}^{-}s$$.
  • Question 5
    1 / -0
    Molten sodium chloride conducts electricity due to presence of: 
    Solution
    In order to conduct electricity a substance must have charge particles, such as electrons and ions, that are free to move freely through it. 
    However in the molten state, ions in ionic compounds are free to flow and therefore molten sodium chloride can conduct electricity.
    Hence Option B is a correct Answer.
  • Question 6
    1 / -0
    Calcium oxide reacts vigorously with water to produce:
    Solution
    $$\text{When calcium oxide-}$$ $$CaO$$ $$\text{is added to water, it reacts vigorously with water to produce slaked lime}$$ $$\text{(calcium hydroxide) and releases a large amount of heat.}$$

    $$\text{The reaction that takes place is:}$$

    $$CaO + H_2O \rightarrow Ca(OH)_2$$


  • Question 7
    1 / -0
    Galvanisation is a method of protecting iron from rusting by coating with a thin layer of
    Solution
    Hint: Galvanisation is a method of protecting iron or steel objects from rusting.

    Step 1: Galvanisation is a process used for the protection of steel or iron objects from rusting by applying a protective zinc layer on the iron surface. Iron metal is dipped in molten zinc to form a protective coating on the surface of the iron. 

    Step 2: When metal is exposed to air for a long time it undergoes corrosion. Corrosion in the case of iron is called rusting. A layer of oxide is formed on the surface of iron called rust which is a brownish colour. Rusting leads to a decrease in the strength of the iron and also economic loss.

    Step 3: There are different methods to prevent corrosion of iron and one such method is Galvanisation. For the galvanised iron, zinc undergoes corrosion instead of iron since the iron surface is not exposed to air thereby protecting iron from rusting.

    Final step: So, the correct option is (C) Zinc.
  • Question 8
    1 / -0
    Water can not be conducting by adding small amount of any of the following except 
    Solution
    As sugar cannot be decomposed into ions and ions are responsible for conduction.
  • Question 9
    1 / -0
    The mass of ions deposited during a given interval of time in the process of electrolysis depends on 
    Solution

     Faraday’ first law of electrolysis states that the mass of the substance (m) deposited or liberated at any electrode is directly proportional to the quantity of electricity or charge (Q) passed.

            For a given interval of time an electric current arises whenever there is a flow of charges (for example, electrons) and is defined as the rate at which charge flows. So, the mass of ions deposited during a given interval of time in the process of electrolysis depends on the current at that interval. [Option A]

  • Question 10
    1 / -0
    If 96500 coulombs of electricity liberates one gram equivalent of anysubstance, the time taken for a current of 0.15 amperes to deposite20mg of copper from a solution of copper sulphate is (Chemicalequivalent of copper = 32)
    Solution
    It is known that mass deposited $$ M = Z it$$
    $$ \Rightarrow M=  20 \times  10 ^{-3} = \left ( \dfrac{32}{96500} \right ) \times  0.15 \times t $$
     = 6.7 min = 6 min 42 sec 
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