On increasing the pressure, the direction in which the gas phase reaction proceeds to re-establish equilibrium is predicted by applying Le-Chatelier's principle. Consider the reaction,
Which of the following is correct, if the total pressure at which the equilibrium is established is increased without changing the temperature?
| 1. | K will remain the same. | 
| 2. | K will decrease. | 
| 3. | K will increase. | 
| 4. | K will increase initially and then decrease, when pressure is very high. | 
Hint: K is only temperature dependent.
Explanation: 
In the reaction, 
If the total pressure at which the equilibrium is established, is increased without changing the temperature, K will remain same. K changes only with change in temperature.
 
                    
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