Question

A chemical process occurring in two steps, is plotted as

The correct statement is

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

Answer 1

Answer: (B)

$A+B\to X\to \left(E_a\right)\uparrow \to$ slow
$X\to AB\left(E_a\right)\downarrow \to$ fast
$\Delta H={\left(E_a\right)}_f-\left(E_a\right)b\downarrow$
$\Rightarrow (-)ve\to$ Exothermic