Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration of reactants. Which of the following statement is correct?
Select the correct option:
A
The order of all the three reactions is same
B
The rate constant of reaction 3 is larger than the rate constant of reaction 2 if the order of reaction is same for both.
C
The SI unit of rate constant of reaction 1 is $\mathrm{s}^{-1}$.
D
Thermal decomposition of HI on gold surface is an example of reaction 2 .
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
⇒ Curve $\mathrm{I}^{\text {st }}$ represent zero order kinetics
$$
\left[\mathrm{R}_{\mathrm{t}}\right]=[\mathrm{R}]_0-\mathrm{Kt}
$$
$\Rightarrow \mathrm{K}_3>\mathrm{K}_2$ (From slope comparison)
⇒ Reaction- 1 is zero order having unit of rate constant same as rate of reaction i.e., molarity / second.
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