Chemical Kinetics and Nuclear ChemistryMedium
Question
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?
Options
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 $s^{- 1}$.
D.Thermal decomposition of HI on gold surface is an example of reaction 2 .
Solution
Sol. [Key Concept: For the same order, a larger rate constant means a steeper decay; read the curves and test each statement against the rate-law units.]
⇒ Curve $I^{st}$ represent zero order kinetics
$$\left\lbrack R_{t} \right\rbrack = \lbrack R\rbrack_{0} - Kt$$
$$\Rightarrow K_{3} > K_{2} $$⇒ Reaction-1 is zero order having unit of rate constant same as rate of reaction i.e., molarity / second.
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