NTA Abhyas NEET2020ChemistryChemical KineticsPractice
Which one of the following options is correct if the activation energies of two reactions are E a 1 and E a 2 with E a 1 > E a 2 and if the temperature of the reacting systems is increased from T to T ´ ?
Options
- Ak1 ′ k 1 = k 2 ′ k 2
- Bk 1 ′ k 1 < 2 k 2 ′ k 2
- Ck 1 ′ k 1 > k 2 ′ k 2
- Dk 1 ′ k 1 < k 2 ′ k 2
Correct answer
C. k 1 ′ k 1 > k 2 ′ k 2
Step-by-step solution
Apply the Arrhenius equation. k = Ae - E a RT Take natural logarithm on both sides. lnk = lnA − E a RT In k 1 ′ k = Ea R 1 T - 1 T ′ = Ea R × ∆ T TT ′ ∆ T is positive, therefore greater the E a value, greater will be the value of k ′ k ∴ k 1 ′ k 1 > k 2 k 2