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JEE Main Chemistry question

ChemistryEquilibriumJEE Main

Two systems PCl₅(g)⇌PCl₃(g)+Cl₂(g) and COCl₂(g)⇌CO(g)+Cl₂(g) are simultaneously in equilibrium in a vessel at constant volume. If some CO is introduced into the vessel, then at the new equilibrium the concentration of:

Answer: (C)

Solution

Added CO shifts the COCl₂ system backward, consuming Cl₂; the drop in [Cl₂] then shifts the PCl₅ system forward, decreasing [PCl₅].

Question ID VK-136052