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Redox and Electrochemistry Test - 1

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Redox and Electrochemistry Test - 1
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Fuel cells are potential source of energy. Which fuel is used to generate electrical energy?

    Solution

    H2, CO, CH4, C3H8 are used as fuels to generate electricity

     

  • Question 2
    1 / -0

    Lead storage battery consists of a group of lead plates bearing compressed spongy lead, alternating with a group of lead plates bearing leaf dioxide, PbO2. Plates are immersed in which solution?

    Solution

    Fact based

     

  • Question 3
    1 / -0

    Molar ionic conductivities of bivalent electrolyte are 57 and 73. The molar conductivity of the solution will be

    Solution

    λm = 57+73=130 Scm2/mol

     

  • Question 4
    1 / -0

    The reduction potential off Li, H2, Cu, Zn are in the order

    Solution

    The electrode/metals are arranged in the order of their increasing value of standard reduction potential on hydrogen scale called the electrochemical series; where, 

    Li= -3.01V 

    Zn= -0.76V 

    H2= 0V 

    Cu= 0.34V

     

  • Question 5
    1 / -0

    The standard EMF of Daniel cell is 1.1 V. The maximum work that can be obtained from the cell is

    Solution

    Electrical work = nFE = 2x96500x1.1 =212.3 KJ

     

  • Question 6
    1 / -0

    One mole of N2H4 loses 10 mol of electron to form a new compound Y. Assuming that all nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation state of hydrogen) -

    Solution

    O.N. of N in N2H4 = –2. One mol of N2H4 contains 2 mol of N-atoms. Thus, 1 mole of N atoms lose 5 mol of electron, each N-atom lose 5 e– there by increasing its O.N. from – 2 to + 3.

     

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