Question:

The activation energy for most of the reactions is approximately $50\, kJ\, mol^{-1}.$ The value of temperature coefficient for such reactions is

Updated On: Jun 8, 2024
  • $ ~>2 $
  • $ ~>3 $
  • $ ~
  • $ ~>4 $
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The Correct Option is A

Solution and Explanation

The temperature coefficient is the ratio of two velocity constant having the difference of $10^{\circ} C$.
Temperature coefficient $=\frac{K_{t}+10}{K_{t}}$
For most of the reaction its value lies between 2 and 3 .
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Concepts Used:

Rate of a Chemical Reaction

The rate of a chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time.

Consider the reaction A → B,

Rate of the reaction is given by,

Rate = −d[A]/ dt=+d[B]/ dt

Where, [A] → concentration of reactant A

[B] → concentration of product B

(-) A negative sign indicates a decrease in the concentration of A with time.

(+) A positive sign indicates an increase in the concentration of B with time.

Factors Determining the Rate of a Reaction:

There are certain factors that determine the rate of a reaction:

  1. Temperature
  2. Catalyst
  3. Reactant Concentration
  4. Chemical nature of Reactant
  5. Reactant Subdivision rate