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(A) The given reaction is $A_{2} \rightleftharpoons 2A$ with $\Delta H > 0$ (endothermic).According to Le Chatelier's principle,for an endothermic rea

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Increase in both temperature and concentration of reactant.

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(A) The given reaction is $A_{2} \rightleftharpoons 2A$ with $\Delta H > 0$ (endothermic).According to Le Chatelier's principle,for an endothermic reaction,an increase in temperature shifts the equilibrium in the forward direction,thereby increasing the yield of the product $A$.Additionally,increasing the concentration of the reactant $A_{2}$ shifts the equilibrium in the forward direction to counteract the change,further increasing the yield of $A$.Therefore,an increase in both temperature and concentration of the reactant will increase the yield of the monomer $A$.

For the endothermic reaction $A_{2} \rightarrow 2A$,which of the following will increase the yield of the monomer $A$?

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