1.Which of the following reactions is spontaneous?
Zn + MgCl2 → ZnCl2 + Mg
Zn → Zn+2 + 2e-
ZnCl2 + Pb → PbCl2 + Zn
ZnCl2 + Al → AlCl3 + Zn
2. Which substance could oxidize lead metal?
a. calcium ions
b. fluoride ion
c. sulfur in acid solution
d. silver metal