Define zero order reaction.A reaction takes place in two steps :(i) NO(g) + Cl2(g) → NOCl2(g)(ii) NOCl2(g) + NO(g) → 2NOCl(g)Write the overall reaction and identify the reaction intermediate.

Q.24 Define zero order reaction.
A reaction takes place in two steps :
(i) NO(g) + Cl₂(g) → NOCl₂(g)
(ii) NOCl₂(g) + NO(g) → 2NOCl(g)
Write the overall reaction and identify the reaction intermediate.

Doubtly Asked 28 Oct 2026 Board exam · March 2025 hsc 12th Save WhatsApp Report

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Answer: Overall: 2NO(g) + Cl₂(g) → 2NOCl(g); intermediate: NOCl₂.

Zero order reaction: A reaction whose rate is independent of the concentration of the reactant, i.e. rate \(= k[\mathrm{A}]^0 = k\). E.g. decomposition of NH₃ on a hot platinum surface.

Overall reaction (adding the two steps and cancelling NOCl₂): 2NO(g) + Cl₂(g) → 2NOCl(g).

Intermediate: NOCl₂, since it is formed in step (i) and consumed in step (ii) and does not appear in the overall equation.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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Define zero order reaction.A reaction takes place in two steps :(i) NO(g) + Cl2(g) → NOCl2(g)(ii) NOCl2(g) + NO(g) → 2NOCl(g)Write the overall reaction and identify the reaction intermediate.

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