3.1 Arrange the following metals in the order in which they displace each other from the solution of their salts: Al, Cu, Fe, Mg and Zn.
3.2 Given the standard electrode potentials, K+/K=-2. 93 V, Ag+/Ag = 0.80 V, Hg2+/Hg =0.79V, Mg2+/Mg=-2.37V, Cr3+/Cr=0.74V.
3.3 Depict the galvanic cell in which the reaction
3.4 Calculate the standard cell potentials of galvanic cell in which the following reactions take place
3.5 Write the Nernst equation and emf of the following cells at 298 K:
3.6 In the button cells widely used in watches and other devices the following reaction takes place:
3.7 Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.
3.8 The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 S cm-1. Calculate its molar conductivity.
3.9 The resistance of a conductivity cell containing 0.001 M KCI solution at 298 K is 1500 Ω What is the cell constant if conductivity of 0.001 M KCI solution at 298 K is 0.146 x 10-3 S cm-1?
3.10 The conductivity of NaCl at 298 K has been determined at different concentrations and the results are given below:
3.11 Conductivity of 0.00241 M acetic acid is 7.896 x 10-5 S cm-1. Calculate its molar conductivity. If Λm0, for acetic acid is 390.5 S cm2 mol-1, what is its dissociation constant?
3.12 How much charge is required for the following reductions:
3.13 How much electricity in terms of Faraday is required to produce .
3.14 How much electricity is required in coulomb for the oxidation of (i) 1 mol of H2O to 02 (ii) 1 mol of FeO to Fe203
3.15 A solution of Ni(N03)2 is electrolyzed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?
3.16 Three electrolytic cells A, B, C containing solutions of ZnS04, AgNO3 and CuS04, respectively are connected in series. A steady current of 1.5 amperes was passed through them until 45 g of silver deposited at the cathode of call B. How long did the current flow? What mass of copper and zinc were deposited?
3.17 Predict if the reaction between the following is feasible:
3.18 Predict the products of electrolysis in each of the following.