In which of the following, $E a$ for backward reaction is greater than $E a$ for forward reaction?

A E_{a} = 50 k c a l - ----- \to B; Δ H = - 10 k c a l

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A E_{a} = 50 k c a l - ----- \to B; Δ H = + 10 k c a l

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A E_{a} = 60 k c a l - ----- \to B; Δ H = + 20 k c a l

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All of the above

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Solution

The correct option is A $A E_{a} = 50 k c a l - ----- \to B; Δ H = - 10 k c a l$
$k = e^{\frac{- E_{a}}{R T}}$
$ln k_{1} = \frac{- E_{a f}}{R T_{1}}$

$ln k_{2} = \frac{- E_{a b}}{R T_{2}}$

$Δ H = E_{a f} - E_{a b} = - 10$
Hence, $E_{a b}$ is greater than $E_{a f} .$
So, here $E_{a}$ for backward reaction is more.

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In which of the following, Ea for backward reaction is greater than Ea for forward reaction?

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