SAMPLE QUESTIONS
1. The enthalpy change for a reaction does not depend upon the
a) physical state of reactants and products
b) use of different reactants for the same products
c) nature of intermediate reaction steps
d) difference in initial or final temperatures of involved substances
2. In view of the signs of Δ
rG
0 for the following reactions
PbO
2 + Pb → 2PbO , Δ
rG
0 < 0
SnO
2 + Sn → 2SnO , Δ
rG
0 > 0
Which oxidation states are more characteristic for lead and tin?
a) For lead + 4, for tin +2
b) For lead +2, for tin +4
c) For lead +4, for tin +4
d) For lead +2, for tin +4