The energy profile diagram for the reaction, $C O (g) + N O_{2} (g) ⇌ C O_{2} (g) + N O (g)$ is given in the figure, the activation energy of the backward reaction is:

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x + y

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x - y

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Solution

The correct option is C x + y
The extra energy needed for the reactant molecules to be able to react chemically is known as Activation energy.
$E_{T} =$ Threshold energy
$E_{a} =$ Activation energy of forward reaction
$E_{a}^{'} =$ Activation energy of backward reaction
$P_{1} =$ Potential energy of reactants
$P_{2} =$ Potential energy of products

So, from the given graph, $x + y$ is the activation energy of the backward reaction.

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