Haber’s process is used for the synthesis of ammonia. The optimum temperature for the Hisber process is?

Correct Answer: B. 130 -150 ˚C

At this temperature range, a compromise is struck between achieving a reasonable reaction rate and minimizing energy costs. Higher temperatures would increase the reaction rate, but they would also require more energy to maintain. The process is carried out at high pressures (around 200 atmospheres) to further improve the yield of ammonia.
So, the correct temperature range for the Haber process is option B, 130 – 150 °C.