For higher yields of ammonia increase in temperature is replaced by which of the following?

Explanation

The reaction is shown in the image attached. On the reactant side, there are 4 moles and on the product side, there are 2 moles. On increasing the pressure, the position of equilibrium will shift towards the side that has less moles of gas, i.e. the product side. Therefore, a greater yield of ammonia will be obtained. Hence A is correct. Remember that YIELD depends on the position of equilibrium. Adding a catalyst makes absolutely no difference to the position of equilibrium - it only speeds up the rate at which a reaction reaches dynamic equilibrium.Decreasing the volume would result in increased pressure. Therefore, the correct answer is all of these: increasing pressure, decreasing volume, and using a catalyst can all be used to increase the yield of ammonia.