alleryLe Chatelier's principle says that if a system at equilibrium is disturbed, the system will shift in the direction that:
AStops the reaction
BReverses the reaction completely
CAmplifies the disturbance
DOpposes the change
Answer & Solution
Correct answer: D. Opposes the change
Le Chatelier's principle in plain English: a disturbed equilibrium pushes back.
If you add more reactant, the forward reaction speeds up to consume some of it.
If you raise temperature on an endothermic reaction, equilibrium shifts forward (absorbs heat).
The system never amplifies the disturbance, never stops, and rarely runs to completion.
Keep practising Unit 7A1: Equilibrium Constant and Dynamic Equilibrium
Browse all Unit 7A1: Equilibrium Constant and Dynamic Equilibrium questions for JEE Advanced, or explore more Chemistry topics.
Related questions
Degree of dissociation α of weak acid HA (Ka = 1.8 × 10⁻⁵) in 0.01 M solution:For the reaction H2(g) + I2(g) ⇌ 2HI(g) with Kc = 50 at 800 K, if [H2] = [I2] = 0.01 M iniIn a saturated solution of AgCl, [Ag+] = 1.26 × 10⁻⁵. If KNO3 is added (no common ion), soAt equilibrium, the ratio of forward to reverse reaction rates:At 298 K, water has Kw = 10⁻¹⁴. Concentration of H+ in pure water:If K = 1 for a reaction, the standard free energy change ΔG°:For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), at equilibrium increasing pressure:For the reaction PCl5(g) ⇌ PCl3(g) + Cl2(g), if initial pressure of PCl5 is P0 and degree