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Which of the following statement is not true. a. an endothermic reaction has an early transition...

Which of the following statement is not true.

a. an endothermic reaction has an early transition state.

b. the transition state of an exothermic reaction resembles reactants.

c. the activation energy of the forward reaction of an exothermic reaction is less than the activation energy of its reverse reaction.

d. an endothermic reaction requires energy to proceed in the forward direction.

Science   Chemistry   
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Answer #1

The statement that is not true is (a).

Endothermic reactions are those reactions which absorbs energy. In such reactions the reactants have lesser energy than the products and energy is needed for the reaction to go forward. So, it takes time to form the transition state. As a result, such reactions does not form transition state early. Therefore, statement a is not true and statement d is true. On the other hand, exothermic reactions are those reactions which releases energy. In such reactions the energy of the products are less than that of the reactanst. They form transition states resembled to the reactants early. Hence, statement c and b are true. Thus, statements (b), (c) and (d) are true and statement (a) is not true.

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