Question

The equilibrium constants for $A _{2}( g ) \rightleftharpoons 2 A ( g )$ at $400\, K$ and $600 \,K$ are $1 \times 10^{-8}$ and $1 \times 10^{-2}$ respectively. The reaction is

• A. Exothermic
• B. Endothermic
• C. May be exothermic or endothermic
• D. No heat is evolved or absorbed

Answer 1

Answer: (B)

$A _{2}( g ) \rightleftharpoons 2 A ( g )$
From the data,
heating leads to increase in $K _{ c }$
$\Rightarrow $ leads to increase in product formation
$\therefore $ Reaction is endothermic in nature.