Two system ${\rm{PC}}{{\rm{l}}_5}\left( {\rm{g}} \right)\;\leftrightharpoons\;{\rm{PC}}{{\rm{l}}_3}\left( {\rm{g}} \right) + {\rm{C}}{{\rm{l}}_2}\left( {\rm{g}} \right);$ and ${\rm{COC}}{{\rm{l}}_2}\left( {\rm{g}} \right)\;\leftrightharpoons\,\;{\rm{CO}}\left( {\rm{g}} \right) + {\rm{C}}{{\rm{l}}_2}\left( {\rm{g}} \right);\;$ are simultaneously in equilibrium in a vessel at constant volume. If some ${\rm{CO}}$ is introduced into the vessel then at the new equilibrium the concentration of :

${\rm{PC}}{{\rm{l}}_5}$ is less

${\rm{PC}}{{\rm{l}}_5}$ is greater

${\rm{PC}}{{\rm{l}}_3}$ remains unchanged

${\rm{C}}{{\rm{l}}_2}$ is greater

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NEET UG CHEMISTRY MCQ: Equilibrium

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Two system

\mathrm{PC}{\mathrm{l}_5}\left( \mathrm{g} \right)\;\leftrightharpoons\;\mathrm{PC}{\mathrm{l}_3}\left( \mathrm{g} \right) + \mathrm{C}{\mathrm{l}_2}\left( \mathrm{g} \right);

and

\mathrm{COC}{\mathrm{l}_2}\left( \mathrm{g} \right)\;\leftrightharpoons\,\;\mathrm{CO}\left( \mathrm{g} \right) + \mathrm{C}{\mathrm{l}_2}\left( \mathrm{g} \right);\;

are simultaneously in equilibrium in a vessel at constant volume. If some

\mathrm{CO}

is introduced into the vessel then at the new equilibrium the concentration of :

View answer and explanation

Correct option: C

\mathrm{PC}{\mathrm{l}_5}

is less

Option C (

\mathrm{PC}{\mathrm{l}_5}

is less) is correct because adding CO shifts the second equilibrium to the left, decreasing Cl2, which then shifts the first equilibrium to the left, decreasing PCl5.

NEET UG CHEMISTRY MCQ: Equilibrium

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