Question

Fill up the following with suitable terms.

(i) Activation energy $=$ Threshold energy $-$ _______.

(ii) Half-life period of zero order reaction $=$ ________.

(iii) Average rate of reaction $=$ _______.

(iv) Instantaneous rate of reaction $=$ ______.

• A. Potential energy, $\frac{0.693}{k},\frac{dx}{dt},\frac{△\left[A\right]}{△t}$
• B. Energy of reactants, $\frac{1}{k},\frac{△\left[A\right]}{△t},\frac{dx}{dt}$
• C. Energy of reaction, $\frac{\log k}{t},\frac{△\left[A\right]}{△t},\frac{dx}{dt}$
• D. Average kinetic energy of reactants, $\frac{a}{2k},\frac{△\left[A\right]}{△t},\frac{dx}{dt}$

Answer 1

The correct option is D Average kinetic energy of reactants, $\frac{a}{2k},\frac{△\left[A\right]}{△t},\frac{dx}{dt}$

a) Activation energy = Threshold energy$-$ the Average kinetic energy of molecules(by definition)

b) half-life of a zero order reaction = $t_{\frac{1}{2}}=\frac{a}{2k}$

c) Average rate of reaction = $\frac{\text{Total change concentration reactants}}{\text{Total time taken}}$ = $\frac{△\left[A\right]}{△t}$

d) Instantaneous rate of reaction =$\frac{\text{Instantaneous change in concentration}}{\text{Instantaneous time}}$=$\frac{dx}{dt}$