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  • Consider the following equilibrium <img alt="\mathrm{CaCO_3 (s)\rightleftharpoons CaO (s)+ CO_2(g)}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7BCaCO_3%20%28s%29%5Cri

Consider the following equilibrium

\mathrm{CaCO_3 (s)\rightleftharpoons CaO (s)+ CO_2(g)}

Which of the following will cause the equilibrium to shift in the forward direction?

Option: 1

\mathrm{Adding\ CaCO_3}


Option: 2

\mathrm{Removing\ CaO}


Option: 3

\mathrm{Adding\ CO_2}


Option: 4

\mathrm{Adding\ some\ NH_3}


Answers (1)

best_answer

As we learnt,

Adding or removing small amount of solid components does not have any effect on equilibrium as the activity of pure solids is 1.

Hence adding CaCO3 or removing CaO does not affect the equilibrium pressure of CO2.

However, adding small amount of NH3 to the equilibrium mixture will cause a decrease in the concentration of CO2 because of an acid base reaction as follows:

\mathrm{2NH_3 (g)+ CO_2(g)\rightleftharpoons (NH_4)_2CO_3(s)}

Due to this, the equilibrium will shift in the forward direction.

Hence, the correct answer is Option (4)

Posted by

Ritika Jonwal

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