(A) According to the Arrhenius equation,the rate constant $K$ is given by $K = A e^{-E_a / RT}$.When the activation energy $E_a$ decreases at a consta

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(A) According to the Arrhenius equation,the rate constant $K$ is given by $K = A e^{-E_a / RT}$.When the activation energy $E_a$ decreases at a constant temperature $T$,the term $E_a / RT$ decreases.Consequently,the exponent $-E_a / RT$ increases (becomes less negative).Since the exponential function $e^x$ is an increasing function,$e^{-E_a / RT}$ increases,leading to an increase in the rate constant $K$.Therefore,the term $E_a / RT$ decreases.

Class 12 Chemistry Chemical Kinetics Collision theory, Energy of activation and Arrhenius equation

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Which among the following is correct when energy of activation,$E_a$ of the catalyzed reaction decreases at constant temperature and for same concentration?

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A
$E_a / RT$ decreases
B
$K$ decreases
C
$e^{-E_a / RT}$ decreases
D
$-E_a / RT$ decreases

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Chemical Kinetics

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Collision theory, Energy of activation and Arrhenius equation

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The first order rate constant $k$ is related to temperature $T$ as $\log \, k = 15.0 - (10^{6} / T)$. Which of the following pairs of values for the Arrhenius factor $A$ and activation energy $E_a$ is correct?

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Which among the following is correct when energy of activation,$E_a$ of the catalyzed reaction decreases at constant temperature and for same concentration?

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The rate of a reaction doubles,when the temperature is changed from $300 \ K$ to $310 \ K$. Activation energy of the reaction is....... $(R=8.314 \ J \ K^{-1} \ mol^{-1}, \log 2=0.301)$

What is the relationship between the temperature $T$ and the activation energy $E_a$ in the Arrhenius equation?

$A$ negative catalyst retards the reaction rate because........

Activation energy for the acid catalysed hydration of sucrose is $6.22 \ kJ \ mol^{-1}$,while the activation energy is only $2.15 \ kJ \ mol^{-1}$ when hydrolysis is catalysed by the enzyme sucrase. Explain.

The first order rate constant $k$ is related to temperature $T$ as $\log \, k = 15.0 - (10^{6} / T)$. Which of the following pairs of values for the Arrhenius factor $A$ and activation energy $E_a$ is correct?

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