(a) For the reaction,
2H2O2 → 2H2O + O2
Since the rate law expression given is,
Rate = k [H2O2]
Hence,
The reaction is of first order.
(b) For the reaction,
NO2 + CO → NO + CO2
Since the rate law given is Rate = k [NO2]2,
The reaction is second order with respect to NO2 and zero order with respect to CO.
Hence the net order of the reaction is,
n = nNO2 + nco = 2 + 0 = 2
(c) For the reaction,
2NO + O2 → 2NO2
Since the rate law expression given is,
Rate = k[NO]2 x [O2]
The reaction is second order with respect to NO and first order with respect to O2.
Hence,
The overall order of reaction is n = nNO2 + no2 = 2 + 1 = 3.
(d) For the reaction,
CHCl3(g) + Cl2(g) → CCl4(g) + HCl(g)
By rate law,
Rate = k [CHCl3] [Cl2]
Reaction is first order with respect to CHCl3 and first order with respect to Cl2.
Hence,
The overall order is,
n = ncHcl3 + ncl2
= 1 + 1 = 2.