10) For the following reduction reaction how many coulombs are required? 1 mol of Cu₂₊ to Cu

a) 193000 C
b) 96500 C
c) 482500 C
d) 386000 C

ANSWER : 193000 C

11) For the following reaction Zn + 2 Ag₊ ? Zn₂₊ + 2 Ag. Calculate the standard EMF of the cell. Given E? Zn, Zn₂₊ = 0.76 volt and E? Ag, Ag+ = -0.80 volt.

a) +0.80 volt
b) 2.12 volt
c) 1.56 volt
d) -1.56 volt

ANSWER : 1.56 volt

12) Calculate the standard cell potential if the standard reduction potential of Cu and Zn are + 0.34V and -0.76V respectively. The cell is shown below Zn ¦ ZnSO4 ¦¦ CuSO4 ¦Cu.

a) 1.10V
b) 2.20V
c) 4.30V
d) 1.50V

ANSWER : 1.10V

13) The EMF of the cell is 0.20V at 298K Cd ¦Cd²⁺ ¦¦ Ni²⁺ (2.0M) ¦ Ni. What is the molar concentration of Cd2+ ions in the solution?

a) 0.05M
b) 0.004M
c) 0.040M
d) 0.03M

ANSWER : 0.040M

14) The standard reduction potential of Cd and Fe electrodes are -0.403 and -0.441 volt respectively. Calculate the emf of the cell Cd ¦ Cd²⁺ (0.001M) ¦¦ Fe²⁺ (0.6M) ¦ Fe

a) 0.44 volt
b) 0.64 volt
c) 0.06 volt
d) 0.044 volt

ANSWER : 0.044 volt

15) The standard electrode potential of Cu and Ag are 0.34V and 0.80V respectively. Calculate the cell potential (E) for the cell containing 0.100M Ag⁺ and 4.00 M Cu²⁺ at 25°C.

a) 0.30V
b) 0.50V
c) 0.71V
d) 0.41V

ANSWER : 0.41V

16) The standard reduction potential for Cu is +0.34V. Calculate the reduction potential if the pH is 14. K_sp of Cu(OH) ₂ is 1.0 x 10^-19.

a) +0.22V
b) -0.22V
c) +0.57V
d) -0.57V

ANSWER : -0.22V

17) Find the valency of the metal whose atomic weight is 96 and 0.3605g of a metal is deposited on the electrode by passing 1.2 ampere current for 15 minutes:

a) 1
b) 2
c) 3
d) None

ANSWER : 3

18) For a given concentration of a solution with increase in temperature:

a) electrolytic conduction increases, metallic conduction decreases.
b) electrolytic conduction decreases, metallic conduction increases.
c) both electrolytic and metallic conduction increases.
d) Both electrolytic and metallic conduction decreases.

ANSWER : electrolytic conduction increases, metallic conduction decreases.

19) The constitute of a Danlell cell is:

a) Cu - Ag cell.
b) Zn – Ag cell
c) Zn – Cu cell
d) None of these.

ANSWER : Zn – Cu cell

20) When electrolysis of aqueous NaCl solution is carried out, the products are:

a) Na at cathode and Cl₂ at anode.
b) H2 at cathode and O₂ at anode.
c) Na at cathode and O₂ at anode.
d) H2 at cathode and Cl₂ at anode.

ANSWER : H2 at cathode and Cl₂ at anode.   

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