Milk turns sour at 40∘C three times as faster as 0∘C. Hence, Ea in the process of turning of milk sour is
2.303×2×313×27340log3
2.303×2×313×27340log(1/3) cal
2.303×2×40273×313log3 cal
None of these
K40∘C=Ae−Ea/R×313K0∘C=Ae−Ea/R×2733=e−Ea/R×(1/313−1/273) On taking logs on both sides, you get the required answer