A very large value of the equilibrium constant $K_c$ indicates that
Athe reaction is very fast.
Bthe reaction is endothermic.
Cthe equilibrium mixture consists mainly of reactants.
Dthe equilibrium mixture consists mainly of products.CORRECT
JUPEBChemistryChemical Equilibrium
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Why the answer is D, and why the others tempt you.
$K_c$ compares product to reactant concentrations, so a large value means products dominate at equilibrium. The constant says nothing about the rate of reaction or its enthalpy change.
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