Part lI 2. Which substance is the strongest reducing agent? a. Sn2* b. Pb2* C. C

Question

Part lI 2. Which substance is the strongest reducing agent? a. Sn2* b. Pb2* C. Cu 3. Which reaction will have the largest equilibrium constant? a. A+BCE".-2.03 V e. insufficient information In the cell Ale Al i Cu oCuran Ptis which will increase the cell voltage the most? a. double (Cu b. double (Cu c halve [Ale) e none of these d. double [Al S. In the voltaic cell Nig Ni CiOn Clozng Pta the anode consists of Pta b. the mass of the anode will decrease c. the cathode consists of Ni) the anode half reaction is cioat le. aorad none of these is correct e. What is Eeee for a voltaic cell made from cobalt and zinc half cells? a. b. 0.48 volt 6. c. +1.04 volt d. -1.04 volt 0.48 volt 7.Which of the following statements is correct? a. one Faraday of charge will plate out two moles of Zn from a solution of Zn(NOs)a b. one Faraday has the same amount of charge as one mole of electrons C. one Faraday transferred will produce 24.3 g Mg in electrolysis of Mg2 d. none of these is correct 8How many Faradays are needed to convert one mole of lOs to l2? c. 10 a. e. insufficient information How many seconds does it take to plate out o.250 mole of Aus from a solution of Au(NOsbs at a current of 15.0 A? a. 4825 s b. 1608 s C. 72,400s d. 24,130s e. none of these

Explanation / Answer

2- Strongest reducing agent among given is,

a) Sn2+

lowest standard reducing potential

3- Largest equilibrium constant value would be for,

b.

4- In the cell the one whch would causemaximum increase in cell voltage is,

c.

5- In the given cell,

b. the mass of anode will decrease

6- the Eocell for voltaic cell comsisting of Co and Zn is

d. 0.48V

7- True statement among the given would be,

b. one faraday has same ampun tof charge as one mole of electron

8- number of faradays needed to convert IO3- to I2,

b. 5

9- moles of Au plated out = 0.250 mol

moles e- used = 3 x 0.250 = 0.750 mol

Coulombs of charge used = 0.750 mol x 96500 = 72375 C

time required to deposit = 72375/15 = 4825 s

a. 4825 s

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