The equations for two reactions are shown. reaction X 2NOBr ⇌ 2NO + Br₂ reaction Y 2NOCl → 2NO + Cl₂ The two reactions have similar reaction mechanisms. The initial rate of reaction X is greater than that of reaction Y when measured under identical conditions of temperature, pressure and reactant concentration. Which statements explain this difference? 1 The activation energy for reaction X is less than that of reaction Y. 2 The Br–Br bond is weaker than the Cl–Cl bond. 3 A higher frequency of collisions between molecules of NOBr occur than between molecules of NOCl.

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