Higher yield of NO in
N₂(g) + O₂ → 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:

This question was previously asked in
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  1. A, D only
  2. B, C only
  3. B, C, D only
  4. A, C, D only

Answer (Detailed Solution Below)

Option 4 : A, C, D only
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Detailed Solution

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CONCEPT:

Effect of Temperature and Concentration on Chemical Equilibrium

  • The given reaction is:

    N₂(g) + O₂(g) → 2NO(g)

  • This reaction is endothermic because ΔH = +180.7 kJ mol⁻¹.
  • According to Le Chatelier's Principle:
    • For an endothermic reaction (ΔH > 0), increasing the temperature shifts the equilibrium toward the products (higher yield of NO).
    • Increasing the concentration of reactants (N₂ and O₂) also shifts the equilibrium toward the products, increasing the yield of NO.

EXPLANATION:

  • Higher temperature: Since the reaction is endothermic, increasing the temperature supplies more energy to drive the reaction forward.
  • Higher concentration of N₂: Adding more N₂ shifts the equilibrium toward the products.
  • Higher concentration of O₂: Adding more O₂ also shifts the equilibrium toward the products.

Therefore, the correct answer is A, C, D only.

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