A graph is plotted between percentage yields of ammonia vs. pressure at 6 different operating temperatures. What would be the effect of 400°C and increasing pressure on percentage yield of ammonia?

(A) Percentage yield of ammonia is increasing.

Explanation

Percentage of ammonia increases with increasing pressure and decreasing temperature. As the curve of ammonia at 400 is rising, so at 400 and increasing pressure percentage of ammonia is increasing.
Alternative explanation: Higher pressures increase yield at all temperatures for this graph.

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