Question

In the manufacture of ammonia by Haber's process :

$N_2\left(g\right)+3H_2\rightleftharpoons 2N{H}_3\left(g\right)+92.3kJ$

Which of the following conditions is unfavourable?

• A. Increasing the temperature
• B. Increasing the pressure
• C. Reducing the temperature
• D. Removing ammonia as it is formed

Answer 1

The correct option is A Increasing the temperature

In the Haber's process for the manufacture of ammonia, a number of moles of reactants is greater than the number of moles of product.

Hence, the increase in pressure and decreasing reactant amount will drive the reaction forward which is favourable. Since the reaction is exothermic, the increase in temperature will drive the reaction backwards which is undesirable.

Hence the correct option is A.