Fill in the blanks by choosing the appropriate word(s) from those given in the brackets…

Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [decreases, $\text{CN}^-$ ion, activation energy, catalyst, two, $\text{Fe}^{2+}$ ion, carbon, lattice energy, enzyme, five, double, halogen, triple, increases] In the Haber process, iron changes the ____ of reaction while molybdenum increases the efficiency of the ____.