In view of the signs of ΔrG° for the following reactions
PbO2+Pb 2PbO, ΔrG°<0
SnO2+Sn 2SnO, ΔrG°>0
'Which oxidation states are more characteristic for lead and tin?
(a) For lead + 4, for tin + 2
(b) For lead + 2 , for tin + 2
(cl For lead + 4, for tin + 4
(d) For lead + 2, tor tin + 4