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A gaseous chain reaction involving strictly the photochemical radical synthesis of hydrogen chlorideChemical Kinetics Chemistry Question

Question

A gaseous chain reaction involving strictly the photochemical radical synthesis of hydrogen chloride, specifically defined as $H_2(g) + Cl_2(g) \xrightarrow{h\nu} 2HCl(g)$, is universally known to rigorously follow which specific macroscopic kinetic reaction order?

Answer: A

💡 Solution & Explanation

Because the massive activation energy barrier is entirely overcome by the external absorption of high-energy photon quanta ($h\nu$) rather than thermal ambient collisions, the overall rate of product generation becomes purely dependent on incoming light intensity, entirely detaching from reactant concentration. Thus, it is perfectly Zero Order.

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