Question

A chemical process occurring in two steps, is plotted as

The correct statement is

• A. Endothermic, $A + B \longrightarrow X$ (slow), $X \longrightarrow AB$ (fast)
• B. Exothermic, $A + B \rightarrow X$ (slow)$X \rightarrow AB$ (fast)
• C. Exothermic, $A+B \longrightarrow X$ (fast) $X \rightarrow AB$ (slow)
• D. Endothermic, $A + B \longrightarrow X$ (fast)$X \rightarrow A B$ (slow)

Answer 1

Answer: (B)

$A+B \rightarrow X \rightarrow\left(E_{a}\right) \uparrow \rightarrow$ slow
$X \rightarrow A B\left(E_{a}\right) \downarrow \rightarrow$ fast
$\Delta H=\left(E_{a}\right)_{f}-\left(E_{a}\right) b \downarrow$
$\Rightarrow (-) v e \rightarrow$ Exothermic