Higher yield of NO in N2(g) + O2(g) ⇌ 2NO(g) can be obtained at [ΔH of the reaction = +180.7 kJ mol–

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Question

Higher yield of NO in N2(g) + O2(g) ⇌ 2NO(g) can be obtained at [ΔH of the reaction = +180.7 kJ mol–1]
A. Higher temperature
B. Lower temperature
C. Higher concentration of N2
D. Higher concentration of O2
Choose the correct answer from the options given below :
(1) A, C, D only
(2) A, D only
(3) B, C only
(4) B, C, D only

Accepted Answer

Correct Answer: A — A, C, D onlyStep-by-step Solution using Le Chatelier's Principle:N₂(g) + O₂(g) ⇌ 2NO(g); ΔH = +180.7 kJ/mol (endothermic); Δngas = 2−2 = 0A. Higher temperature ✓: Endothermic reaction is favoured by increasing temperature (heat acts as a reactant). Equilibrium shifts right → more NO.B. Lower temperature ✗: Favours the reverse (exothermic) direction → less NO.C. Higher [N₂] ✓: Adding more reactant → equilibrium shifts right → more NO.D. Higher [O₂] ✓: Adding more reactant → equilibrium shifts right → more NO.Note: Pressure has NO effect here because Δngas = 0 (same moles of gas on both sides).Key Concepts:Le Chatelier's Principle: When a system at equilibrium is disturbed, it shifts to counteract the disturbance.Effect of temperature: Increasing T favours the endothermic direction (ΔH > 0 → K increases with T).Effect of concentration: Adding a reactant shifts equilibrium to the right; adding a product shifts it to the left.Effect of pressure: No effect when Δngas = 0.

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