MCQ
If the pressure in a reaction vessel for the following reaction is increased by decreasing the volume, what will happen to the concetrations of  $CO$  and $CO_2$ ?

${H_2}O(g){\mkern 1mu} {\mkern 1mu}  + {\mkern 1mu} CO{\mkern 1mu} (g){\mkern 1mu} {\mkern 1mu} {\mkern 1mu}  \rightleftharpoons \,{H_2}(g)\, + \,C{O_2}(g)\, + \,Heat{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} $

  • A
    Both the $[CO]$ and $[CO_2]$ will decrease
  • B
    Neither the $[CO]$ nor the $[CO_2]$ will change
  • C
    The $[CO]$ will decrease and the $[CO_2]$ will increase
  • Both the $[CO]$ and $[CO_2]$ will increase

Answer

Correct option: D.
Both the $[CO]$ and $[CO_2]$ will increase
(D) both the $[\mathrm{CO}]$ and $\left[\mathrm{CO}_{2}\right]$ will increase

For the reaction-

$\mathrm{H}_{2(\mathrm{g})}+\mathrm{CO}_{(\mathrm{g})} \rightleftharpoons \mathrm{H}_{2(\mathrm{g})}+\mathrm{CO}_{2(\mathrm{g})}+\text { Heat }$

On decreasing the volume, the concentrations of both, i.e., reactants and products will increase.

Hence the both $[\mathrm{CO}]$ and $\left[\mathrm{CO}_{2}\right]$ will increase.

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