Introduction to Reversible and Irreversible Reactions
The reactions...
Question
The reactions PCl5(g)⇌PCl3(g)+Cl2(g) and COCl2(g)⇌CO(g)+Cl2(g) are simultaneously in equilibrium at constant volume. A few moles of CO(g) are introduced into the vessel. After some time, the new equilibrium concentration of
A
PCl5will remain unchanged
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B
Cl2will be greater
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C
PCl5will become less
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D
PCl5will become greater
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Solution
The correct option is CPCl5will become less When CO is added to the above system, the second reaction will go backwards in accordance with Le Chatelier's principle and hence, the concentration of the common molecule, i.e. Cl2 will also reduce.
So, to counter the decreased concentration of chlorine, first equilibrium will go forward and hence, the concentration of PCl5 will decreased.