Give examples of zero order reaction .

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Answer

→ Zero order reaction are relatively uncommon but they occur under special condition.
→ Some enzyme catalyzed reaction and reaction which occur on metal surface are a few examples of zero order reactions.
→ The decomposition of gaseous ammonia on hot platinum surface is a zero order reaction at high pressure.
$2 NH _3(g)$ $\xrightarrow[\text { Pt catalyst }]{1130 K}$$N _2(g)+3 H _2(g)$
Rate $= k \left[ NH _3\right]^0= k$
→ In this reaction, platinum metal acts as a catalyst.
→ At high pressure, the metal surface gets saturated with gas molecules.
→ So, a further change in reaction condition is unable to alter the amount of ammonia on the surface of the catalyst making rate of the reaction independent of its concentration.
→ The thermal decomposition of HI on gold surface is another example of zero order reaction.

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