Q8 / 54 · JEE Advanced 2017 (Paper 2) · Chemistry
In a bimolecular reaction, the steric factor was experimentally determined to be . The correct option(s) among the following is(are)
- AThe value of the frequency factor predicted by the Arrhenius equation is higher than that determined experimentally.
- Correct answerBThe activation energy of the reaction is unaffected by the value of the steric factor.
- CSince , the reaction will not proceed unless an effective catalyst is used.
- Correct answerDThe experimentally determined value of the frequency factor is higher than that predicated by the Arrhenius equation.
Solution
The Arrhenius equation is
\(\mathrm{k}=\mathrm{Ae}^{-\mathrm{Ea} / \mathrm{RT}}\)
where A = Pre-exponential factor
A is not directly related with temperature and activation energy.
Where \(A=\underset{\text { (Frequency factor) }}{Z} \times \underset{\text { (Steric factor) }}{P}\)
Hence we can say the \(\mathrm{E}_{\mathrm{a}}\) is independent of steric factor
\(\mathrm{P}=\frac{\mathrm{K}_{\text {actual }}}{\mathrm{K}_{\text {theoretical }}}\)
So, \(A_{\text {actual }}>A_{\text {theoretical }}\)
Hence, the correct answer is options: 'B', 'D'.