In which  of the following equilibrium K_{c} and K_{p} are not equal?

  • Option 1)

    2NO_{\left ( g \right )}\rightleftharpoons N_{2\left ( g \right )}+O_{2\left ( g \right )}

  • Option 2)

    SO_{2\left ( g \right )}+NO_{2\left ( G \right )}\rightleftharpoons SO_{3\left ( g \right )}+NO_{\left ( g \right )}

  • Option 3)

    H_{2\left ( g \right )}+I_{2\left ( g \right )}\rightleftharpoons 2HI_{\left ( g \right )}

  • Option 4)

    2C_{\left ( s \right )}+O_{2\left ( g \right )}\rightleftharpoons 2CO_{2\left ( g \right )}

 

Answers (1)

As we discussed in concept

Relation between Kp and Kc -

K_{p}=K_{c}(RT)^{\bigtriangleup n}

while calculating the value of Kp , pressure should be expressed in bar.

1\:bar=10^{5}pa

- wherein

\bigtriangleup n = (number of moles of gaseous products) - (number of moles gaseous reaction)

 

 K_{p}=K_{c}.(RT)^{\Delta n}

In 1), 2) and 3) \Delta n=0, \:\:\:i.e\:\:\:\:K_{p}=K_{c}

In 4) \Delta n=2-1=1

\therefore K_{p}\neq K_{c}

 


Option 1)

2NO_{\left ( g \right )}\rightleftharpoons N_{2\left ( g \right )}+O_{2\left ( g \right )}

This option is incorrect.

Option 2)

SO_{2\left ( g \right )}+NO_{2\left ( G \right )}\rightleftharpoons SO_{3\left ( g \right )}+NO_{\left ( g \right )}

This option is incorrect.

Option 3)

H_{2\left ( g \right )}+I_{2\left ( g \right )}\rightleftharpoons 2HI_{\left ( g \right )}

This option is incorrect.

Option 4)

2C_{\left ( s \right )}+O_{2\left ( g \right )}\rightleftharpoons 2CO_{2\left ( g \right )}

This option is correct.

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