By decreasing the pressure the reaction will go to that direction where_________________?
Correct answer: B. volume increased
- A. volume is decreased
- B. volume increased
- C. heat absorbed
- D. no. of moles of specie decreased
Explanation
When pressure is decreased, a gaseous equilibrium shifts toward the side with more gas molecules because that side occupies a greater volume and partly offsets the pressure decrease. Thus the favoured direction is the one in which volume increases. Students may choose the side with fewer moles by reversing the pressure rule, but increased pressure, not decreased pressure, favours fewer gas moles.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Le Chatelier's Principle
Le Chatelier's principle predicts how an equilibrium responds when concentration, pressure or temperature changes. Questions apply it to reversible reactions, identify the direction of shift and distinguish genuine equilibrium changes from the effect of a catalyst, which changes the rate of reaching equilibrium but not its position.
Practise Chemical Equilibrium
625 free Chemical Equilibrium MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Le Chatelier's Principle questions
In the reaction A + B gives C + D at equilibrium, adding more of substance A will
For an endothermic reaction at equilibrium, raising the temperature will
Adding a catalyst to a system at equilibrium
For a reaction involving only gases at 25?C the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp ?
Which of the following will not change the concentration of ammonia at the equilibrium ?
A chemical engineer wants to use the Haber process in order to produce ammonia as raw material for fertilizers. Which of the following parameters must the chemical engineer AVOID in order to obtain the maximum yield of ammonia?N2(g) + 3H2(g) -> 2NH3(g) ΔH0 = -92.6 kJ/mol