For the reaction 2A + B → C + D, measurement of rule of reaction at varying concentrations are given belowThe rate law is therefore

Rate  =  k (A)m(B)n   2.5 =  k(0.01)m (0.01)n  ------- 1 5.0 =  k(0.01)m (0.02)n   ------- 2  45 =  k(0.03)m (0.02)n -------- 3  On solving,  m = 2, n = 1