4 The rate law for the reaction 2H₂(g) + 2NO(g) N₂(g) + 2H₂O(g) is rate = k[H₂][NO]. Which of the following mech- anisms can be ruled out on the basis of the observed rate expression? Mechanism I H₂ + NO N + NO O + H₂ H₂O + N N₂ + O H₂O Mechanism II H₂ + 2NON₂O + H₂O N₂O + H₂N₂ + H₂O Mechanism III 2NO-N₂0₂ N₂O₂ + H₂N₂O + H₂O N₂O + H₂ →→→→N₂ + H₂O (slow) (fast) (fast) (slow) (fast) (fast equilibrium) (slow) (fast)

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