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# Which one of the following is true for an exothermic reaction $A \rightleftharpoons B$ if $E_{r}\: and \: E_b$ are the activation energies of forward and backward reactions respectively?

$\begin {array} {1 1} (1)\;E_r > E_b & \quad (2)\;E_r = E_b \\ (3)\;E_r = - E_b & \quad (4)\;E_r < E_b \end {array}$

(4) $E_r &lt; E_b$