Finding standard reduction potential of tin

Question

Assignment:

Q1. Consider an electrochemical cell constructed from the following half cells, linked by an external circuit and by a KCl salt bridge:

an Al(s) electrode in 1.0 M Al(NO3)3 solution
a Pb(s) electrode in 1.0 M Pb(NO3)2 solution

What is the balanced overall (net) cell reaction?

Pb(s) + Al3+(aq) Pb2+(aq) + Al(s)
3Pb(s) + 2Al3+(aq) 3Pb2+(aq) + 2Al(s)
3Pb2+(aq) + 2Al(s) 3Pb(s) + 2Al3+(aq)
Pb2+(aq) + Al(s) Pb(s) + Al3+(aq)

Q2. Calculate the value of E^ocell for the following reaction:

2Au(s) + 3Ca2+(aq) 2Au3+(aq) + 3Ca(s)

-4.37 V
-1.37 V
-11.6 V
1.37 V
4.37 V

Q3. An electrochemical cell based on the following reaction has a standard cell voltage (Eocell) of 0.48 V.

Sn(s) + Cu2+(aq) Sn2+(aq) + Cu(s)

What is the standard reduction potential of tin?

Sn2+(aq) + 2e- Sn(s)

-0.14 V
0.14 V
-0.82 V
0.82 V
None of the above

Q4. Which chemical species undergoes reduction according to the following cell diagram?

Sn | Sn2+ || NO3- (acid soln), NO(g) | Pt

Sn
Sn2+
NO3-
NO
Pt

Q5. In the following half equation, which is the oxidizing agent?

NO3-(aq) + 4H+(aq) + 3e- NO(g) + 2H2O

NO3-
H+
e-
NO
H2O

Q6. Which statement is true in regard to a spontaneous redox reaction?

Eored is always negative.
Eocell is always positive.
Eoox is always positive.
Eored is always positive.

Q7. Which of the following species is the strongest oxidizing agent under standard state conditions?

Ag+(aq)
H2(g)
H+(aq)
Cl2(g)
Al3+(aq)

Q8. Calculate the cell emf for the following reaction:

2Ag+(0.010 M) + H2(1 atm) 2Ag(s) + 2H+ (pH = 10.0)

1.04 V
1.27 V
0.92 V
0.56 V
0.80 V

Q9. A current of 2.50 A was passed through an electrolytic cell containing molten CaCl2 for 4.50 hours. How many moles of calcium metal should be deposited?

5.83 x 10-5 mol
0.210 mol
0.420 mol
0.840 mol
1.95 x 109 mol

Q10. How long will it take to produce 78 g of Al metal by the reduction of Al3+ in an electrolytic cell with a current of 2.0 A?

0.01 s
420 s
13 h
116 h
1.0 x 10¹² s

Q11. According to the band theory, which of the following provide(s) an explanation for the high electrical conductivity of metals?

a partly filled conduction band
a valence band overlapping an empty conduction band
a filled valence band
a large gap between the valence band and the conduction band
1 and 2
1 and 3
3
3 and 4
4

Q12. Which one of the following elements would form p-type semiconductors when added to silicon crystals?

C
P
As
Ga
Mg

Q13. The electron configuration of an Fe2+ ion is ________.

[Ar]4s24d4
[Ar]4s23d6
[Ar]3d3
[Ar]3d5
[Ar]3d6

Q14. How many 3d electrons does a Mn2+ ion have?

1
2
3
4
5

Q15. In the complex ion [Fe(CN)6]4-, the oxidation number of Fe is ________.

+1
+2
+3
-4
+6

Q16. In the complex ion [Co(en)2Br2]+, the oxidation number of Co is ________.

+1
+2
+3
-2
-1

Q17. A bidentate ligand always ________.

has bonds formed to two metal ions
has a charge of 2+ or 2-
forms complex ions with a charge of 2+ or 2-
has two donor atoms
has medical uses

Q18. Which one of the following is a monodentate ligand?

CN-
EDTA
C2O42- (oxalate ion)
H2NCH2CH2NH2 (ethylenediamine)

Q19. The best name for [Co(en)2Br2]Br is ________.

cobalt(III)bis(ethylenediamine) bromide
dibromobis(ethylenediamine)cobalt(III) bromide
dibromidedi(ethylenediamine)cobalt(III) bromide
dibromodiethylenediaaminecobalt(III) bromide
tribromobis(ethylenediamine)cobalt(III)

Q20. The correct formula for the dichlorobis(ethylenediamine)chromium(III) ion is ________.

[Cr(en)2Cl2]3+
[Cr(en)Cl2]+
[Cr(en)2Cl2]2+
[Cr(en)2Cl2]+
[Cr(en)3Cl2]+