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Equilibrium
Heterogeneous Equilibrium and Le Chatelier's Principle
1 question from 1 paper, each with its answer.
- question
- 1
- paper
- 1
- of Equilibrium
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Concepts tested
- Kp depends only on temperature
All Questions
2002 AIPMT 1 question
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Reaction $BaO_2(s) \rightleftharpoons BaO(s) + O_2(g)$; $\Delta H$ = +ve. In equilibrium condition, pressure of $O_2$ depends on : -For this heterogeneous equilibrium, the solids do not appear in the equilibrium expression (their activity is constant): $K_p = p_{O_2}$.
So the equilibrium pressure of $O_2$ equals $K_p$. Adding more $BaO_2$ or BaO does not change it.
$K_p$ changes only with temperature. The forward reaction is endothermic ($\Delta H$ positive), so by Le Chatelier's principle an increase in temperature shifts the equilibrium forward and increases $p_{O_2}$.
So the pressure of $O_2$ depends on increasing the temperature at equilibrium.