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Q1. The equilibrium constant for the reaction given below at 298 K is : Zn(s)+Fe^(2+) (aq)⟶Zn^(2+) (aq)+Fe(s); E_cell^° = 2905 V at 298 K
•   e^(0.32/0.0295)
•  〖10〗^(0.595/0.76)
•  〖10〗^(0.0250/0.32)
•  〖10〗^(0.32/0.295)
Solution

Q2.On the basis of the following E° values, the strongest oxidizing agent is : [Fe(CN)_6 ]^(4-)→[Fe(CN)_6 ]^(3-)+e^-; E°=-0.35 V Fe^(2+)⟶Fe^(3+)+e^- ; E°=0.77 V
•  Fe^(2+)
•  Fe^(3+)
•  [Fe(CN)_6 ]^(3-)
•  [Fe(CN)_6 ]^(4-)
Solution

Q3.  Consider the following E^° values 〖E°〗_(Fe^(3+)/ Fe^(2+) )= + 0.77 V 〖E°〗_(Sn^(2+)/ Sn) = - 0.14 V Under standard conditions the potential for the reaction Sn (s) + 〖2Fe〗^(3+) (aq) → 〖2Fe〗^(2+) (aq) + Sn^(2+) (aq) is
•   1.68 V
•  1.40 V
•  0.63 V
•  0.91 V
Solution

Q4. The rusting of iron takes place as follows 〖2H〗^+ + 〖2e〗^- +1/2 O_2 ⟶ H_2 O (l); E^° = +1.23 V Fe^(2+) + 〖2e〗^- ⟶ Fe (s); E^° = -0.44 V Calculate Î”G° for the net process.
•  -76 kJ mol^(-1)
•  -152 kJ mol^(-1))
•  -161 kJ mol^(-1)
•  -322 kJ mol^(-1)
Solution

Q5.Which one of the following has the highest molar conductivity?
•  Potassium hexacyanoferrate (II)
•  Hexaaquochromium (III) bromide
•  Diaminedichloroplatinum (III)
•  Tetraaminedichlorocobalt (III) chloride
Solution

Q6. The metal that forms a self protecting film of oxide to prevent corrosion is
•  Na
•  Al
• Cu
•  Au
Solution
B

Q7.What is the cell reaction occurring in Daniel cell (Galvanic cell)?
•  Cu(s) + ZnSO_4 (aq) ⟶ CuSO_4 (aq) + Zn(s
•  2Na(s) + CdSO_4 (aq) ⟶ Na_2 SO_4 (aq) + Cd (s)
•  Zn(s) + CuSO_4 (aq) → Cu(s) + ZnSO_4 (aq)
•  Ni(s) + ZnSO_4 (aq) ⟶ NiSO_4 (aq) + Zn(s)
Solution

Q8.On the basis of electrochemical theory of aqueous corrosion, the reaction occurring at the cathode is
•  H_2 (g)+2OH^- (aq)→2H_2 O(l)+2e^-
•  O_2 (g)+4H^+ (aq)+4e^-→2H_2 O(l)
•  Fe(s)→Fe^(2+) (aq)+2e^-
•  Fe^(2+) (aq)→Fe^(3+) (aq)+e^-
Solution

Q9.The equivalent conductances of two strong electrolytes at infinite dilution in H_2 O (where ions move freely through a solution) at 25℃ are given below Î›°_(CH_3 COONa)=91.0 S cm^2/equiv Î›°_HCl=426.2 S cm^2/equiv What additional information/quantity one needs to calculate Î›° of an aqueous solution of acetic acid?
•  Î›° of chloroacetic acid (ClCH_2 COOH)
•  The limiting equivalent conductance of H^+ (〖Î»°〗_(H^+ ))
•  Î›° of CH_3 COOK
•  Î›° of NaCl
Solution

Q10. Cu^+ ion is not stable in aqueous solution because of disproportionation reaction. E^° value for disproportionation of Cu^+ is (given,E_(Cu^(2+) / Cu^+)^°=0.15,E_(Cu^(2+)/ Cu)^°=0.34 V)
•  - 0.38 V
•  + 0.38 V
•  + 0.49 V
• - 0.49 V
Solution

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