With the halp of ionic equations describe what happen: When(i)&nb
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    Electrochemistry

    Multiple Choice QuestionsShort Answer Type

    91. What is the effect of an increase in the concentration of zinc ions on the electrode potential of zinc electrode for which E° equals – 0.76 V?
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    92. What is a primary cell? Give an example.
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    93. Express the relation between conductivity and molar conductivity of a solution. 
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    Multiple Choice QuestionsLong Answer Type

    94. Explain with examples the terms weak and strong electrolytes. How can these be distinguished?
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    95.

    Predict the products of electrolysis in each of the following:
    (i) An aqueous solution of AgNO3 with silver electrodes.
    (ii) An aqueous solution of AgNO3 with platinum electrodes.
    (iii) A dilute solution of H2SO4 with platinum electrodes.
    (iv) An aqueous solution of CuCl2 with platinum electrodes.

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    96.

    Depict the galvanic cell in which the reaction
    Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s) takes place. Further show:
    (i) Which of the electrode is negatively charged?
    (ii) The carriers of the current in the cell.
    (iii) Individual reaction at each electrode.

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    Multiple Choice QuestionsShort Answer Type

    97. Following two reactions can occur at cathode in the electrolysis of aqueous sodium chloride:
    Na+ + e– → Na(s) 2H2O(l) + 2r → H2(g) + 2OH–(aq)
    E°red = – 0.83 V
    Which reaction takes place preferentially and why?
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    98. Iron does not rust even if zinc coating is broken in galvanized iron pipe. Explain.
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    99. Explain why:
    (i) E° for Mn3+ / Mn2+ couple is more positive than that Fe3+/Fe2+. (At. No. Mn = 25, Fe = 26).
    (ii) Ce3+ can be easily oxidised to Ce4+ (At. No. Ce= 58).
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    100. With the halp of ionic equations describe what happen: When
    (i) pH of a solution of dichromate ions is raised.
    (ii) Potassium manganate is electro-chemically oxidised.

    when pH is increased, i.e., solution is more basic, orange coloured d

    when pH is increased, i.e., solution is more basic, orange coloured dichromate ion change to yellow coloured chromate ion.
    when pH is increased, i.e., solution is more basic, orange coloured d
    When potassium manganate is electro-chemically oxidised i.e., undergoes, electrolytic oxidation, it forms purple colour KMnO4.
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