Ncert Exercises & Solutions

Consider the Arrhenius equation given below and choose the correct option:

$k = A e^{- \frac{E_{a}}{R T}}$

1.	Rate constant increases exponentially with increasing activation energy and decreasing temperature.
2.	Rate constant decreases exponentially with increasing activation energy and decreasing temperature.
3.	Rate constant increases exponentially with decreasing activation energy and decreasing temperature.
4.	Rate constant increases exponentially with decreasing activation energy and increasing temperature.

HINT: Use Arrhenius equation.

Explanation:

$According$ $to$ $Arrhenius$ $equation$ $k = {Ae}^{- E_{a} / RT}$
$Here,$                             $k \propto e^{- E_{a}}$
                                      $k \propto e^{- \frac{1}{T}}$
                                      $\propto e^{T}$

which indicates that as activation energy decreases rate constant increases and as the temperature increases the rate of reaction increases.
According to the Arrhenius equation, the rate constant increases exponentially with decreasing activation energy and increasing temperature

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