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6.1. Equilibrium - 1 (chemical Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.1. Equilibrium - 1 (chemical Equilibrium)1 Mark
MCQ
At a certain temperature in a $5\,L$ vessel, $2\,moles$ of carbon monoxide and $3\,moles$ of chlorine were allowed to reach equilibrium according to the reaction, $CO + C{l_2} \rightleftharpoons COC{l_2}$ . At equilibrium, if one mole of $CO$ is present then equilibrium constant $(K_c)$ for the reaction is
  • ✓
    $2.5$
  • B
    $4$
  • C
    $2$
  • D
    $3$
✓

Answer

Correct option: A.
$2.5$
a
Initially $2$ moles of $CO$ are present. 

At equilibrium, $1$ mole of $CO$ is present 

Hence, $2-1=1$ moles of $CO$ has reacted. 

$1$ mole of $CO$ will react with $1$ mole of $Cl_2$ to from $1$ mole of $COCl_2$.

$3-1=2$ moles of $Cl_2$ remains at equilibrium 

The equlibrium constant

${K_c} = \frac{{[COC{l_2}]}}{{[CO][C{l_2}]}} = \frac{{\frac{{1\,mol}}{{5\,L}}}}{{\frac{{1\,mol}}{{5\,L}} \times \frac{{2\,mol}}{{5\,L}}}} = 2.5$

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