Compromise temperature in Haber process Steps:

• Recall Haber process: N₂ + 3H₂ ⇌ 2NH₃ (exothermic, ΔH negative).
• Apply Le Chatelier's principle: higher temperature shifts equilibrium left, reducing ammonia yield.
• Note reaction rate increases with temperature, enabling faster production.
• Conclude 450°C balances low yield from heat with high rate for industrial efficiency.

Why B is correct:

• B states a moderate temperature optimizes rate and yield; Le Chatelier's principle shows yield favors low temperature, but kinetics require higher for viable production rate.

Why the others are wrong:

• A: Incorrect; high temperature decreases equilibrium yield per Le Chatelier's principle for exothermic reaction.
• C: Assumes irrelevant to temperature choice; focuses on pressure, not thermal effects.
• D: Wrong; ignores rate-yield trade-off, as very low temperature slows reaction excessively.

Final answer: B