Electrochemistry

Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Electrochemistry” of Chemistry.

  • Q1.What would happen if the electrodes used in the electrolysis process are reactive:

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  • Q2.9.65 C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus, obtained is completely converted into a Grignard reagent. The number of moles of the Grignard reagent obtained is:

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  • Q3.Resistance of a conductive cell filled with a solution of an electrolyte of concentration 0.1 M is 100 Ω. The conductivity of this solution is 1.29 S  m 1 . Resistance of the same cell when filled with 0.2 M of the same solution is 520 Ω. The molar conductivity of 0.2 M solution of the electrolyte will be:

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  • Q4.Two Faraday of electricity is passed through a solution of CuS O 4 . The mass of copper deposited at the cathode is (at. mass of Cu = 63.5 u)

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  • Q5.Given, E C r 3+ / Cr =0.74 V; E Mn O 4 / M n 2+ =1.51 V E C r 2 O 7 2 / C r 3+ =1.33 V; E Cl/ C l =1.36 V
    Based on the data given above strongest oxidising agent will be

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  • Q6.Which of the following reaction is preferred during electrolysis of dilute sulphuric acid:

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  • Q7.The standard electrode potential for the half cell reactions are:
    Zn ++ +2 e Zn, E 0 =0.76 V Fe ++ +2 e Fe, E 0 =0.44 V
    The E.M.F. of the cell reaction
    Fe ++ +Zn Zn ++ + Fe is

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