For the reaction 2SO2(g) + O2(g) 2SO3(g), H = -57.2\ kJ\ mol-1 and Kc = 1.7 1016. Which of the following statements is…
Chemical Equilibrium · Class 11 · JEE Main Previous Year Question
For the reaction , and . Which of the following statements is incorrect?
- a✓
The equilibrium constant is large suggestive of reaction going to completion and so, no catalyst is required
- b
The equilibrium will shift in forward direction as the pressure increases
- c
The equilibrium constant decreases as the temperature increases
- d
The addition of inert gas at constant volume will not affect the equilibrium constant
The equilibrium constant is large suggestive of reaction going to completion and so, no catalyst is required
Step 1 — Evaluate each statement:
(1) Large no catalyst needed: ✗ Incorrect — being large means the reaction is thermodynamically favorable, but it says nothing about the rate. A catalyst is needed to achieve equilibrium at a practical rate (e.g., in Contact process).
(2) Pressure increase forward shift: ✓ Correct — , so increasing pressure shifts equilibrium forward.
(3) decreases with temperature increase: ✓ Correct — reaction is exothermic (), so increasing T shifts equilibrium backward decreases.
(4) Inert gas at constant volume no effect: ✓ Correct — partial pressures unchanged.
Answer: Option (1) — Incorrect statement
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