Exercises

Exercises Answers to Some Intext Questions . E (cell) = . V . − ∆ = − r G . kJ mol , K c = . × . . , . × – mol L – . The conductivity of sodium chloride at K has been determined at different concentrations and the results are given below: Concentration/M . . . . . × k /S m – . . . . . Calculate Λ m for all concentrations and draw a plot between Λ m and c ½ . Find the value of . . Conductivity of .00241 M acetic acid is . × – S cm – . Calculate its molar conductivity. If for acetic acid is . S cm mol – , what is its dissociation constant? . How much charge is required for the following reductions: (i) mol of Al + to Al? (ii) mol of Cu + to Cu? (iii) mol of MnO – to Mn + ? . How much electricity in terms of Faraday is required to produce (i) . g of Ca from molten CaCl ? (ii) . g of Al from molten Al O ? . How much electricity is required in coulomb for the oxidation of (i) mol of H O to O ? (ii) mol of FeO to Fe O ? . A solution of Ni(NO ) is electrolysed between platinum electrodes using a current of amperes for minutes. What mass of Ni is deposited at the cathode? . Three electrolytic cells A,B,C containing solutions of ZnSO , AgNO and CuSO , respectively are connected in series. A steady current of . amperes was passed through them until . g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited? . Using the standard electrode potentials given in Table . , predict if the reaction between the following is feasible: (i) Fe + (aq) and I – (aq) (ii) Ag + (aq) and Cu(s) (iii) Fe + (aq) and Br – (aq) (iv) Ag(s) and Fe + (aq) (v) Br (aq) and Fe + (aq). . Predict the products of electrolysis in each of the following: (i) An aqueous solution of AgNO with silver electrodes. (ii) An aqueous solution of AgNO with platinum electrodes. (iii) A dilute solution of H SO with platinum electrodes. (iv) An aqueous solution of CuCl with platinum electrodes.