Which reaction occurs most rapidly at standard conditions?
h2(g) + i2(s) 2hi(g)
cu(s) + s(s) cus(s)
c6h12o6(s) + 6o2(g) 6co2(g) + 6h2o(g)
5c2o42-(aq) + 2mno4-(aq) + 16h+(aq) 10co2(g) + 2mn2+(aq) + 2h2o(l)
ag+(aq) + i-(aq) agi2(s)
nextreset

The reaction occurs most rapidly at standard conditions are:
H2(g) + I2(s) 2HI(g)

The reaction that do not occur rapidly at standard conditions are 
Cu(s) + S(s) CuS(s)
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g)
5C2O42-(aq) + 2MnO4-(aq) + 16H+(aq) 10CO2(g) + 2Mn2+(aq) + 2H2O(l)
Ag+(aq) + I-(aq) AgI2(s)

B. nuclear reactions could first occur.