The transition-state model for reaction rate assumes that the activated complex:. (1) is in equilibrium with the reactants. (2) is gaseous at low concentrations. (3) may decompose to form products or may revert to reactants.

1 and 3

Explanation:

The transition-state model for reaction rate also referred to as theory of absolute reaction rates explains the relationship between equilibrium, activation energy and reaction rates. It assumes that the activated complex is in equilibrium with the reactants and may decompose to form products or may revert to reactants.

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