Chemical Kinetics - Result Question 5
####5. Consider the given plot of enthalpy of the following reaction between $A$ and $B . A+B \longrightarrow C+D$
Identify the incorrect statement.
(2019 Main, 9 April II)
(a) $D$ is kinetically stable product.
(b) Formation of $A$ and $B$ from $C$ has highest enthalpy of activation.
(c) $C$ is the thermodynamically stable product.
(d) Activation enthalpy to form $C$ is $5 kJ mol^{-1}$ less than that to form $D$.
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Answer:
Correct Answer: 5. (c)
Solution:
- Only statement (d) is incorrect. Corrected statement is “Activation enthalpy to form $C$ is $15 kg mol^{-1}$ more than $5 kg$ $mol^{-1}$ that is required to form $D$.” It can be easily explained by following graph.
Activation enthalpy (or energy) is the extra energy required by the reactant molecules that result into effective collision between them to form the products.
